| Justin Ricard | P | 2020-2020 | Florida Intl |
| Matt Ricardy | 2B | 1999-2000 | San Diego State, Porterville College, Yuba CC |
| Michael Ricchi | P | 2012-2013 | Presbyterian College |
| James Ricchio | P | 2004-2007 | Central Michigan |
| Nate Ricci | OF | 2013-2016 | Jacksonville |
| Anthony Ricciardi | P | 2010-2013 | Alabama State |
| Dante Ricciardi | SS | 2016-2018 | Georgetown, St. Petersburg College, Bryant University |
| Mariano Ricciardi | IF | 2019-2020 | Florida Atlantic, Cypress College, Dayton |
| Tommy Ricciardi | C | 2013-2015 | Miami |
| David Riccio | P | 2002-2002 | Connecticut |
| Peter Riccio | IF | 2002-2003 | Villanova |
| Kevin Ricciuti | P | 2004-2004 | Akron |
| Tom Ricciutti | P | 2007-2007 | Villanova |
| Kaden Riccomini | P | 2020-2020 | UC Davis |
| Adam Rice | OF-IF | 2008-2010 | Coastal Carolina, Iowa, Elgin CC |
| Allen Rice | 2B | 2002-2005 | Alabama |
| Andy Rice | 1B | 2006-2008 | Mississippi State, Itawamba CC |
| Ben Rice | C | 2019-2020 | Dartmouth |
| Brian Rice | P | 2010-2013 | Hartford, Rowan |
| Ethan Rice | IF | 2015-2018 | East Tennessee State, Walters State CC |
| Garrett Rice | 1B | 2004-2007 | Samford |
| Hunter Rice | P | 2014-2015 | College of Charleston, Spartanburg Methodist College, Northwest Florida State College |
| Jack Rice | P | 2008-2011 | Wagner |
| Jacob Rice | OF-IF | 2011-2014 | Arkansas, West Virginia, Eastern Oklahoma State College |
| Jake Rice | P | 2017-2017 | Tennessee Tech |
| Jake Rice | P | 2018-2020 | Presbyterian College, Gulf Coast CC |
| Jonathan Rice | P | 2019-2019 | Coppin State College |
| Keaton Rice | C | 2018-2020 | Bradley |
| Logan Rice | IF-P | 2011-2014 | East Tennessee State |
| Matt Rice | P | 2002-2002 | Indiana |
| Nick Rice | P | 2008-2011 | Southern Illinois, NC State, Madison Area Technical College |
| Paul Rice | 3B | 2004-2007 | Bradley |
| Perry Rice | P | 2007-2007 | Miss. Valley St |
| Stephen Rice | P | 2000-2002 | Hofstra |
| Steve Rice | OF | 2007-2011 | Towson |
| Steven Rice | P | 2011-2014 | Vanderbilt |
| Tim Rice | C | 2000-2002 | Washington, Tacoma CC |
| Tyler Rice | IF | 2019-2020 | Texas-Arlington |
| Vincent Rice | OF-P | 2017-2019 | SUNY-Farmingdale |
| Will Rice | OF | 2005-2008 | Tulane, USC |
| David Rich | P | 2003-2005 | James Madison |
| Kyle Rich | P | 2020-2020 | Dallas Baptist |
| Taylor Rich | P | 2017-2019 | Lamar, San Jacinto |
| TJ Rich | 1B | 2011-2012 | Memphis, Middle Georgia |
| Alex Richard | P-OF | 2007-2009 | Louisiana Tech |
| Billy Joe Richard | H | 2000-2002 | Oral Roberts |
| Chase Richard | P | 2008-2010 | Southern |
| Damien Richard | OF | 2015-2019 | Xavier |
| Jeff Richard | P | 2006-2008 | Central Michigan, Coastal Carolina |
| Jon Richard | P | 2010-2013 | Xavier |
| Kelsey Richard | C-P | 2014-2018 | Northwestern State |
| Matt Richard | OF | 2012-2013 | Nicholls State, LSU-Eunice |
| Myles Richard | P | 2012-2015 | Texas Southern, Mt. Hood CC, San Jose State |
| Ryan Richard | P | 2002-2002 | San Diego |
| Zac Richard | P | 2007-2010 | Xavier |
| Brock Richards | C | 2001-2002 | Cleveland State |
| Chase Richards | IF | 2004-2005 | Lamar, Seminole State College |
| David Richards | OF | 2013-2015 | Savannah State, Darton College |
| Derek Richards | C | 2010-2011 | Coppin State College |
| Ethan Richards | P | 2018-2018 | Air Force |
| Garrett Richards | P | 2017-2020 | James Madison, Danville Area CC |
| Grant Richards | C | 2009-2012 | The Citadel |
| Greg Richards | P | 1972-1975 | Oregon |
| Jabari Richards | OF | 2016-2019 | Furman |
| Jairus Richards | OF | 2017-2019 | Cal State Fullerton, Cabrillo College |
| Jip Richards | P | 2011-2014 | Davidson College |
| Julian Richards | P | 2005-2008 | New York Tech |
| Justin Richards | 3B | 2004-2005 | West Virginia |
| Kellan Richards | P | 2016-2019 | Missouri Western State University |
| Lane Richards | IF | 2013-2016 | Notre Dame |
| Lucas Richards | P | 2019-2019 | Coppin State College |
| Robbie Richards | C | 2006-2007 | Southern Utah, Southern Nevada |
| Thomas Richards | OF | 2011-2014 | University at Buffalo |
| Tim Richards | SS | 2014-2017 | Cal State Fullerton |
| Trey Richards | 3B | 2000-2002 | New Mexico State, Hawaii |
| Alex Richardson | P | 2013-2016 | Prairie View A&M, Vernon College |
| Andrew Richardson | P | 2009-2013 | New Orleans, Louisiana-Monroe |
| Barry Richardson | P | 2003-2004 | College of Charleston, Lake City CC |
| Blaine Richardson | 1B | 2004-2006 | The Citadel |
| Blake Richardson | P | 2005-2005 | Memphis, Northwest Mississippi CC |
| Brian Richardson | 2B | 1999-2002 | Charleston Southern |
| Cayman Richardson | IF | 2017-2019 | Virginia |
| Dan Richardson | P | 2007-2007 | Air Force |
| David Richardson | P | 2005-2008 | Georgia Southern |
| Gene Richardson | P | 1998-1999 | Florida SW, Florida Southern |
| Grant Richardson | OF | 2019-2020 | Indiana |
| Jake Richardson | IF-OF | 2010-2010 | Oakland |
| Jay Richardson | P | 2000-2002 | South Alabama |
| Jeremy Richardson | H | 2008-2008 | Texas Southern, Tennessee Tech |
| Joe Richardson | P | 2010-2011 | George Washington, Saddleback College |
| John Richardson | P | 2005-2005 | Richmond |
| Josh Richardson | 2B | 2004-2007 | Indiana |
| Justin Richardson | OF | 2009-2011 | Liberty |
| Kagan Richardson | P | 2013-2017 | Villanova, Santa Ana College |
| Ken Richardson | P | 2005-2008 | Maryland-Eastern Shore |
| Kyle Richardson | SS-2B | 2007-2010 | Cal State Bakersfield, Sierra College |
| Kyle Richardson | OF | 2013-2016 | Notre Dame |
| Kyle Richardson | P | 2017-2019 | Texas A&M |
| Kyle Richardson | C | 2019-2020 | East Tennessee State |
| Kyle Richardson | IF | 2019-2020 | Jacksonville |
| Leonard Richardson | OF | 2012-2012 | Florida A&M |
| Maddex Richardson | P | 2018-2019 | Western Kentucky, North Georgia |
| Mason Richardson | P | 2014-2014 | Louisville |
| Matt Richardson | SS | 2002-2004 | High Point |
| Matt Richardson | OF | 2006-2006 | Mississippi State, John A. Logan College |
| Matt Richardson | P | 2016-2018 | Hawaii, Cosumnes River College |
| Matt Richardson | IF | 2018-2020 | Utah |
| Michael Richardson | IF | 2018-2020 | Campbell, Harford CC, Ohio |
| Nick Richardson | C | 2004-2004 | Shelton State CC, Alabama |
| Noah Richardson | P-1B | 2019-2020 | Northern Kentucky |
| Robbie Richardson | P | 2009-2011 | Pacific, Cosumnes River College |
| Ryan Richardson | OF | 2006-2008 | Central Florida, Seminole Florida |
| Ryan Richardson | C | 2002-2003 | Oklahoma, Central Arizona College |
| Ryan Richardson | P | 2003-2004 | Sam Houston State, Wharton County Junior College |
| Ryan Richardson | IF | 2011-2015 | Michigan State, Elgin CC, Nebraska |
| Sterling Richardson | P | 2020-2020 | Kennesaw State |
| Steven Richardson | P | 2010-2012 | Presbyterian College, Richland College |
| TJ Richardson | C | 2015-2018 | Presbyterian College |
| Tom Richardson | C | 2011-2011 | Georgia Southern, Chattahoochee Val |
| Travis Richardson | P | 2013-2016 | Florida A&M, Central Florida CC |
| Tre Richardson | IF | 2020-2020 | Baylor |
| Trey Richardson | C-IF | 2010-2013 | USC-Upstate |
| Wallace Richardson | OF | 2007-2007 | Cleveland State |
| Walt Richardson | IF | 2020-2020 | Coastal Carolina |
| Will Richardson | IF-P | 2019-2019 | Arkansas State, Jefferson College |
| Adam Richart | C | 2010-2011 | Indiana State, Lincoln Trail College |
| Jordan Richartz | OF | 2013-2015 | Hawaii, Bellevue CC |
| Teon Richburg | OF | 2004-2009 | Coppin State College, Frostburg State |
| Ty Riche | IF | 2018-2020 | Ark-Little Rock, Mississippi Delta CC |
| Andy Riche' | OF | 2007-2010 | McNeese State |
| Matt Richer | C | 2011-2013 | North Dakota, Carthage College |
| Griffin Richeson | IF | 2009-2012 | Butler |
| Logan Richetti | IF | 2003-2003 | Connecticut |
| Cody Richey | P | 2014-2017 | Incarnate Word |
| Gardner Richey | OF | 2010-2011 | Samford |
| J.R. Richey | OF | 2011-2011 | Jackson State |
| Kyland Richey | IF-P | 2019-2020 | Jackson State |
| Matthew Richey | P | 2016-2019 | Bradley |
| Michael Richey | C | 2017-2017 | Ball State |
| Sam Richey | C | 2003-2003 | Notre Dame |
| Paul Richie | C | 2001-2004 | Oregon State |
| Cam Richins | IF | 2017-2018 | Brigham Young |
| Cameron Richman | OF | 2016-2019 | Portland |
| Antonio Richmond | OF | 2005-2007 | Savannah State |
| Jake Richmond | IF | 2014-2018 | Cincinnati, Northern Kentucky |
| John Richmond | 2B-SS | 1999-2002 | Penn State |
| Jon Richmond | P | 2001-2003 | Arkansas |
| Scottie Richmond | OF | 2003-2004 | Miss. Valley St |
| Elliot Richoux | C | 2013-2013 | Texas Tech, Howard College |
| Kyle Richter | P | 2011-2013 | USC |
| Matt Richter | P | 2003-2004 | Alcorn State |
| Nick Richter | 3B | 2013-2015 | Rider, McHenry County College |
| Raine Richter | P | 2018-2020 | Indiana State, Fort Scott CC |
| Ryan Richter | P | 2009-2012 | Notre Dame |
| Ryan Richter | IF | 2013-2015 | Penn State |
| Stephen Richter | P | 2006-2007 | Princeton |
| Stephen Richter | P | 2011-2013 | Delaware, West Chester |
| Tommy Richter | IF | 2015-2018 | College of Charleston |
| Paul Richy | P | 2016-2019 | UNLV |
| Cory Rickard | OF | 2005-2006 | Washington, Spokane Falls CC |
| Willie Rickard | OF | 2002-2003 | Louisiana-Monroe, Barton County CC |
| John Rickards | 2B | 2005-2008 | La Salle |
| Jake Rickenbach | SS | 2008-2012 | Utah Valley U |
| Wes Rickenberg | P | 2015-2018 | Bowling Green State |
| Dave Ricker | IF | 2011-2011 | Southern Utah, Mt. San Jacinto College |
| David Ricker | P | 2007-2012 | UNC Asheville, Maine |
| Jeff Rickert | P-IF | 2004-2007 | Valparaiso |
| Ryan Rickett | P | 2018-2020 | Missouri, Grayson County College, Rice |
| Caleb Ricketts | UT | 2019-2020 | San Diego |
| Jon Ricketts | OF-P | 2004-2006 | Delaware State |
| Ralph Rickey | OF | 1967-1967 | Oklahoma |
| Alan Rickman | P | 2016-2019 | Tennessee-Martin, Jackson State CC, Lee University |
| Jarrod Rickman | 1B-P | 2012-2015 | Furman |
| Trey Ricko | P | 2019-2020 | Tennessee-Martin |
| Trey Rickrode | IF | 2011-2012 | McNeese State |
| Eric Ricks | P | 2013-2014 | Savannah State, Abraham Baldwin Agricultural College |
| Tom Ricks | SS | 1975-1977 | USC |
| Tyrell Ricks | P | 2016-2016 | Maryland-Eastern Shore |
| John Ricotta | 1B | 2016-2019 | Ball State, Monroe CC |
| Jimmy Ricoy | OF | 2012-2015 | Massachusetts-Lowell |
| Michael Ricupito | IF | 2016-2019 | Pacific |
| Tobey Riday-White | OF | 2001-2002 | Fresno State, Laney College |
| Ian Riddell | P | 2014-2014 | Rutgers |
| Justin Riddell | OF | 2008-2011 | Cincinnati |
| Logan Riddell | P | 2013-2014 | SE Louisiana, Jones County Junior College |
| Chase Ridder | IF | 2016-2016 | Seattle |
| Andrew Riddick | P | 2019-2019 | Norfolk State, Virginia State |
| Dwight Riddick | IF | 2017-2018 | Norfolk State |
| Micah Riddick | OF | 2017-2018 | St. Bonaventure, Ulster County CC |
| Nathan Riddick | P | 2010-2010 | Texas Southern, Eastfield College |
| Adam Riddle | OF | 2002-2002 | Nebraska, New Mexico JC |
| Dylan Riddle | P | 2016-2020 | UC Irvine |
| Nick Riddle | OF | 2005-2008 | Appalachian State |
| Scott Riddle | IF | 2009-2010 | Elon |
| Steven Riddle | OF | 2020-2020 | Nevada |
| Adrian Rider | P | 2003-2004 | Creighton, Nebraska |
| Bryan Rider | P | 2004-2006 | Missouri, Western Kentucky, Mt. Hood CC |
| Joshua Rider | P | 2007-2008 | Tennessee Tech |
| Trent Rider | P | 2017-2018 | College of Charleston, Shelton State CC |
| Zach Rider | P-OF | 2016-2019 | McNeese State |
| Cole Ridgely | P | 2014-2018 | Stephen F. Austin, McLennan CC |
| Zack Ridgely | P | 2015-2019 | Radford |
| Beau Ridgeway | P | 2016-2019 | Texas |
| Tyler Ridgeway | P | 2014-2014 | Navy |
| Trent Ridgley | P | 2004-2007 | West Virginia |
| Jake Ridgway | P | 2018-2020 | Indiana State |
| Matt Ridilla | OF | 2007-2007 | North Florida |
| Devin Ridlehoover | IF-OF | 2007-2008 | Appalachian State |
| Colin Ridley | OF | 2016-2019 | Maine |
| Conor Ridley | P | 2018-2019 | Oregon State, Sonoma State |
| Cale Ridling | IF-OF | 2017-2018 | Ark-Little Rock, East Central MO |
| Eli Riechmann | P | 2018-2020 | Texas Tech, Blinn College |
| Jeff Riedel | OF | 2017-2018 | Ball State, Jackson CC |
| Daniel Rieder | IF | 2006-2007 | Texas-Arlington, Clarendon College |
| John Rieg | IF | 2000-2003 | Duquesne |
| Brad Riegler | P | 2007-2010 | Illinois-Chicago |
| Brian Riegler | C | 2008-2011 | Indiana State, Northern Illinois, Kishwaukee College |
| Michael Rieker | P | 2015-2017 | Air Force |
| Tom Rieker | P | 2008-2008 | Niagara, University at Buffalo |
| Tim Rielly | C | 2007-2007 | Rutgers |
| Austin Rieman | IF | 2014-2017 | Ohio, Missouri Baptist, John A. Logan College |
| Danny Riemenschneider | P | 2008-2010 | Arkansas State |
| Mike Riemer | OF | 2010-2013 | Central Ct State, Eastern Connecticut State |
| Michael Rienerth | P-IF | 2013-2015 | Old Dominion |
| Doug Riepe | IF-OF | 2001-2004 | Wake Forest |
| Santiago Riera | IF | 2018-2020 | Manhattan College |
| Sean Rierson | P | 2001-2005 | Arizona |
| Dayton Ries | IF | 2005-2006 | New Mexico State, Hutchinson CC |
| Garrett Ries | C | 2020-2020 | South Dakota State |
| Mark Ries | P | 2008-2010 | North Dakota State |
| Andrew Riesenfeld | C | 2000-2003 | Virginia |
| Mike Riesner | IF | 2015-2018 | Bradley, Hofstra |
| Kyle Riesselmann | OF | 2020-2020 | Georgia State |
| Wendell Rieves | IF-P | 2016-2019 | Miss. Valley St, Mississippi Delta CC |
| Michael Riewer | OF | 2009-2010 | North Dakota State, Ridgewater College |
| Patrick Riewer | P-OF | 2013-2014 | North Dakota, Ellsworth CC |
| Travis Rife | P | 2003-2007 | Duquesne |
| Eric Riffe | IF | 2020-2020 | Western Kentucky |
| Mark Riffee | OF | 2008-2008 | Virginia |
| Matt Riffee | P | 2006-2007 | Harvard |
| Kyle Riffel | OF | 2006-2008 | Iowa |
| Jake Riffice | IF | 2012-2015 | Iowa, Sierra College, American River College, Cal State Monterey Bay |
| John Riffle | P | 2003-2003 | West Virginia |
| Brad Rifkin | 1B | 2006-2007 | Brown |
| Jake Rifkin | P | 2009-2012 | Marist |
| Matt Rigby | P | 2013-2016 | Utah Valley U, Feather River College, Texas-Pan American |
| Paxton Rigby | IF-OF | 2017-2020 | Georgia Tech |
| Ryan Rigby | P | 2016-2018 | Mississippi State, East Mississippi CC, West Alabama |
| Dave Rigdon | P | 2008-2008 | Georgia Southern |
| Vince Riggi | OF | 2004-2007 | Richmond |
| Austin Riggins | OF | 2016-2019 | Penn State |
| Norbert Riggins | IF-P | 2010-2013 | Alabama A&M |
| Travis Riggins | P | 2002-2002 | Northern Iowa |
| Phil Riggio | C | 2007-2010 | Sacred Heart |
| Jon Riggleman | IF | 2004-2004 | Central Ct State, St. Petersburg College, Hillsborough CC |
| Bill Riggs | P | 2002-2005 | Davidson College |
| Justin Riggs | 3B-P | 2004-2005 | Coppin State College |
| Trevor Riggs | OF | 2015-2016 | Radford |
| Randy Righter | IF | 2015-2018 | Bowling Green State |
| Sean Rigney | P | 2007-2007 | Marshall |
| Will Rigney | P | 2020-2020 | Baylor |
| Jack Rigoni | OF | 2019-2019 | SIU-Edwardsville, Jefferson College |
| Kevin Rigopoulos | P | 2008-2010 | Hofstra |
| Tyler Rigot | --- | 2020-2020 | Bucknell |
| Hunter Rigsby | IF | 2001-2002 | Tennessee |
| Hunter Rigsby | P | 2019-2020 | Kentucky |
| Mitch Rigsby | 2B | 2000-2003 | James Madison |
| Joey Riherd | IF-C | 2017-2018 | Pacific |
| Casey Rihn | IF | 2009-2009 | South Carolina, Santa Ana College |
| Chase Rihtarchik | P | 2011-2014 | Michigan State |
| Ryan Rijo | 1B | 2018-2019 | New Mexico JC, Lubbock Christian University |
| TJ Riles | OF | 2015-2018 | East Carolina, Wallace CC, Georgia Perimeter College, Faulkner |
| Aidan Riley | OF | 2020-2020 | Delaware |
| Allen Riley | OF | 2009-2012 | Pacific |
| Ben Riley | P | 2002-2004 | Tennessee, Iowa Western CC |
| Braeden Riley | IF | 2008-2011 | Sam Houston State |
| Bubby Riley | LF | 2013-2015 | Delgado CC, NC State |
| Chris Riley | P | 2004-2005 | Valparaiso |
| Connor Riley | P | 2017-2020 | Long Beach State |
| Danny Riley | C | 2016-2019 | Illinois-Chicago |
| Derek Riley | P | 2009-2009 | Chandler-Gilbert CC, Arkansas State |
| Gabe Riley | 1B-OF | 2003-2003 | Va. Commonwealth |
| Heath Riley | P | 2008-2010 | Ball State |
| Jack Riley | P | 2016-2018 | Connecticut, St. Petersburg College, Massachusetts-Lowell |
| Joe Riley | P | 2002-2002 | Connecticut |
| Kejuan Riley | OF | 2010-2011 | Alabama State |
| Kevin Riley | IF | 2001-2002 | Rider |
| Kevin Riley | 1B | 2017-2018 | Cal State Northridge, Chaffey College |
| Kyle Riley | H | 2004-2004 | Murray State |
| Landon Riley | P | 2018-2020 | Liberty |
| Nick Riley | P | 2011-2014 | Mount Saint Mary |
| Pat Riley | H | 2006-2006 | Temple |
| Patrick Riley | P | 2003-2006 | James Madison |
| Patrick Riley | P | 2013-2015 | Georgia Southern, Tallahassee CC |
| Philip Riley | P | 2006-2007 | Jackson State CC, SE Missouri State |
| Tanner Riley | P | 2018-2020 | Abilene Christian, Hill College |
| Timothy Riley | 2B-OF | 2000-2000 | James Madison |
| Travis Riley | P | 2017-2017 | Longwood |
| Trevor Riley | P | 2019-2019 | New Mexico, Palomar College |
| Trumaine Riley | OF | 2004-2007 | Eastern Michigan |
| Travis Rima | OF | 2004-2005 | Morehead State, North Iowa Area CC |
| Kolby Rimer | P | 2011-2015 | Southern Utah, CSU-Pueblo |
| Adam Rimmer | P | 2016-2016 | Tennessee-Martin |
| Sean Rimmer | IF-OF | 2020-2020 | Brigham Young |
| Andrew Rinaldi | IF | 2008-2011 | Quinnipiac |
| Anthony Rinaldi | IF-OF | 2013-2017 | Lehigh |
| Chris Rinaldi | IF | 2017-2020 | Holy Cross |
| Russell Rinaldi | OF | 2002-2003 | Saint Peter's |
| Tom Rinaldi | C | 2003-2007 | UMD-Baltimore Cty, Villanova |
| Tom Rinaldi | IF | 2014-2018 | Central Ct State, Bridgeport |
| Trey Rinando | P | 2002-2004 | Lamar |
| Danny Rinck | OF | 2009-2011 | Xavier |
| Eaton Rincon | IF | 2007-2007 | New Mexico State, New Mexico JC |
| Everett Rincon | IF | 2002-2006 | Sacramento State |
| Jeider Rincon | P | 2015-2017 | San Francisco, Kansas |
| Ruben Rincon | P | 2015-2015 | Grand Canyon, Paradise Valley |
| Tanner Rindels | OF | 2008-2008 | Seward County CC, Texas Tech |
| Jared Rine | P | 2019-2020 | Kennesaw State |
| Alex Rinearson | IF | 2005-2006 | Butler |
| Anthony Rinehart | H | 2009-2010 | Western Illinois |
| Brian Rinehart | 2B | 2000-2000 | Georgia Southern |
| Joel Rinehart | P | 2010-2013 | Navy |
| Dylan Riner | OF | 2012-2015 | Austin Peay, Shorter |
| Matt Riney | P | 2016-2017 | Texas Tech, Ranger College, Newman |
| Blake Ring | P | 2003-2005 | Arkansas State |
| Garrett Ring | P | 2013-2016 | Middle Tenn State |
| Matt Ring | P | 2011-2014 | Cincinnati |
| Nate Ring | IF | 2010-2013 | Cal State Northridge |
| Neil Ring | C | 2018-2018 | Old Dominion |
| Tanner Ring | IF | 2013-2016 | Arkansas State |
| Jon Ringenberg | P-1B | 2008-2011 | Baylor |
| Adam Ringer | OF | 2003-2004 | Pacific, San Joaquin Delta College |
| Jarrod Ringer | P | 2002-2005 | La Salle |
| Cameron Ringo | P | 2016-2016 | Binghamton |
| Craig Ringwald | P | 2002-2003 | Murray State, Three Rivers CC |
| Chris Rini | P | 2004-2004 | Rutgers |
| Thomas Rinn | OF | 2014-2014 | Incarnate Word |
| Brandon Rinnan | P | 2004-2005 | Northern Iowa, Yavapai College |
| Eric Rinzel | C | 2020-2020 | Missouri |
| Dominic Rio | OF | 2004-2005 | Western Kentucky, Treasure Valley CC |
| Lewis Rion | OF | 2013-2015 | New York Tech |
| BT Riopelle | C | 2019-2020 | Coastal Carolina |
| Jake Riordan | OF | 2002-2003 | Florida, Santa Fe CC |
| Luke Riordan | OF-IF | 2003-2005 | Cal State Northridge |
| Tyler Riordan | P | 2009-2010 | Central Ct State, Connecticut-Avery Point |
| George Rios | IF | 2006-2006 | Southern, Miami-Dade College |
| Gustavo Rios | 1B | 2015-2018 | Alabama State |
| Josh Rios | P | 2017-2018 | Cal State Fullerton, Long Beach City College |
| Lee Rios | IF | 2012-2015 | Texas-Pan American |
| Luis Rios | OF | 2015-2016 | Long Island-Brooklyn |
| Marcos Rios | C | 2000-2000 | Chabot College, South Carolina |
| Melvin Rios | C-OF | 2012-2015 | Long Island-Brooklyn |
| Roberto Rios | IF | 2008-2008 | Wichita State |
| Ruben Rios | P | 2012-2013 | North Carolina Central, College of the Redwoods |
| Ryan Rios | P | 2014-2016 | Texas Southern |
| Wallace Rios | IF-C | 2015-2017 | Alcorn State |
| Nick Riotto | OF | 2014-2017 | Penn State |
| Julian Rip | OF | 2017-2020 | USC-Upstate, Hutchinson CC |
| Peter Ripke | IF-P | 2014-2017 | High Point |
| Barrett Ripley | OF | 2003-2007 | Va. Commonwealth |
| Brandon Ripley | P | 2001-2004 | Lafayette College |
| Jim Ripley | P | 2003-2004 | Kansas State, Connors State College |
| Will Ripoll | P | 2019-2019 | LSU |
| Blake Ripp | P | 2019-2020 | George Washington |
| Derek Ripp | IF | 2019-2020 | Arkansas, George Washington |
| Jake Rippee | 2B | 2004-2006 | Baylor |
| Ryan Rippee | 1B | 2013-2016 | Jefferson College, SE Missouri State |
| Stephen Ripper | 1B | 2003-2003 | Texas, Galveston College |
| Max Rippl | OF-P | 2019-2020 | Kent State |
| Ross Ripple | P | 2011-2014 | Georgia |
| Matt Risdon | C | 2013-2014 | Western Illinois, Kishwaukee College |
| AJ Risdorph | P | 2007-2011 | Indiana U.-Purdue U.-FW |
| Matt Riser | OF | 2005-2006 | Tulane, Pearl River CC |
| Jordan Rishavy | OF | 2011-2012 | Northern Illinois, North Iowa Area CC |
| Jimmy Risi | 1B | 2012-2012 | Butler, Muscatine CC |
| Dak Rissman | P | 2011-2011 | East Tennessee State, Palm Beach State College |
| Chuck Ristano | P | 2001-2004 | Sacred Heart |
| Henry Ristvedt | --- | 2020-2020 | Nebraska at Omaha, Des Moines Area CC |
| Daniel Ritcheson | P | 2018-2019 | San Diego State |
| Ben Ritchey | P | 2014-2017 | UC Irvine, Sacramento City College |
| Brandon Ritchie | P | 2014-2017 | George Washington |
| Max Ritchie | P | 2014-2017 | Brown |
| Nolan Ritchie | IF | 2017-2018 | Abilene Christian, Cisco Junior College |
| Stuart Ritchie | SS | 2003-2004 | Radford, Walters State CC |
| Todd Ritchie | OF | 2013-2014 | Texas Tech, Howard College |
| Mike Ritson | P | 2008-2010 | Winthrop, Slippery Rock Pennsylvania |
| Bo Ritter | P | 2015-2018 | Arkansas State |
| Chris Ritter | IF | 2010-2010 | Bradley |
| Christopher Ritter | C | 2019-2019 | Army |
| Geoff Ritter | OF | 2007-2007 | Butler |
| John Ritter | C | 2019-2019 | Youngstown State |
| Sean Ritter | C | 2013-2014 | Canisius College |
| Shane Ritter | P | 2016-2019 | Iowa |
| Jordan Rittiner | P | 2010-2010 | LSU |
| Brian Ritz | IF | 2009-2011 | Indiana |
| Jordan Ritz | OF | 2012-2013 | Fairleigh Dickinson |
| Alec Ritzenthaler | P | 2019-2020 | Canisius College |
| Paul Ritzheimer | OF | 2011-2013 | Murray State, Kaskaskia College |
| Ryan Ritzzo | P | 2006-2006 | Sacred Heart |
| Lawrence Riva | C | 2001-2002 | Sam Houston State, Mineral Area College |
| Nick Rivas | P | 2014-2014 | McNeese State |
| Steven Rivas | OF | 2018-2020 | Long Beach State, Southern Nevada, Houston |
| Lester Rivenbark | C | 2007-2010 | NC A&T State |
| Adam Rivera | P | 2007-2010 | Saint Joseph's |
| Andy Rivera | P | 2017-2019 | Middle Tenn State, Chattanooga State Technical CC, Lee University |
| Arles Rivera | P | 2006-2009 | Bethune-Cookman |
| Brance Rivera | IF | 2009-2012 | Texas Christian |
| Brenden Rivera | IF-OF | 2014-2015 | High Point |
| Bryan Rivera | P | 2011-2012 | Bethune-Cookman |
| Bryan Rivera | IF | 2014-2015 | Central Ct State, Connecticut-Avery Point |
| Cesar Rivera | OF | 2011-2015 | Alabama State, Bethune-Cookman |
| Charlie Rivera | P-IF | 2009-2009 | Seton Hall |
| Chris Rivera | IF | 2013-2014 | Delaware State |
| Damian Rivera | P | 2011-2015 | Saint Louis |
| David Rivera | P | 2010-2014 | The Citadel, El Camino College, Campbell |
| Derek Rivera | C | 2019-2020 | Savannah State |
| Eddie Rivera | C | 2003-2003 | Eastern Illinois, Wabash Valley College |
| Edgardo Rivera | P | 2014-2014 | Alabama State |
| Edwin Rivera | H | 2006-2006 | Mercer |
| Felipe Rivera | IF-OF | 2014-2014 | La Salle |
| Frankie Rivera | OF | 2011-2011 | Texas Southern, Indian Hills CC-Centerville |
| Gabe Rivera | P | 2012-2014 | Florida Gulf Coast |
| Gabe Rivera | P | 2015-2018 | Delaware State |
| Gabe Rivera | OF | 2018-2020 | Miami |
| Geo Rivera | P | 2020-2020 | Old Dominion |
| Israel Rivera | P | 2005-2006 | Bethune-Cookman |
| Jeremy Rivera | P | 2019-2020 | Alabama State |
| Jorge Rivera | C | 2019-2019 | Alabama State |
| Jose Rivera | H | 2006-2007 | Arkansas-Pine Bluff |
| Josh Rivera | 3B | 2020-2020 | Florida |
| Josue Rivera | OF | 2018-2018 | Bethune-Cookman |
| Karter Rivera | P | 2009-2010 | Va Military Inst. |
| Marco Rivera | P | 2007-2008 | SUNY - Albany, Monroe CC |
| Mario Rivera | P | 2007-2008 | Nevada, Arizona Western College |
| Matt Rivera | C | 2019-2020 | La Salle |
| Miguel Rivera | H | 2018-2020 | Delaware State |
| Miguel Rivera | IF | 2020-2020 | Indiana State |
| Milton Rivera | IF | 2015-2018 | NC A&T State |
| Moises Rivera | IF | 2005-2008 | Maine, Siena College |
| Nick Rivera | 1B | 2014-2017 | Florida Gulf Coast |
| Orlando Rivera | P | 2008-2008 | Alabama A&M |
| Ricardo Rivera | P | 2019-2020 | Alabama State |
| Ricky Rivera | OF | 2004-2005 | Oral Roberts, Eastern Oklahoma State College |
| Ricky Rivera | P | 2017-2017 | Cal State Northridge |
| Ricky Rivera | C | 2020-2020 | Houston Baptist |
| Santino Rivera | IF | 2018-2020 | Long Beach State |
| Sebastian Rivera | OF | 2015-2017 | Alabama State, Eastern FL ST |
| Stephen Rivera | P | 2009-2012 | St. John's |
| Yan Rivera | SS | 2015-2017 | La Salle |
| Zack Rivera | IF | 2013-2016 | Long Beach State |
| Zak Rivera | 1B | 2003-2006 | UW Milwaukee |
| Devin Rivera Ozuna | P | 2017-2019 | Coppin State College |
| Steven Rivera-Chijin | SS-2B | 2018-2020 | Texas A&M-Corpus Christi |
| Daniel Rivero | P | 2017-2018 | Miami |
| Eddie Rivero | IF | 2020-2020 | Xavier |
| James Rivero | OF | 2002-2002 | Loyola Marymount |
| Casey Rivers | OF | 2008-2008 | USC-Upstate, Worcester State College |
| CJ Rivers | 1B | 2020-2020 | Cal State Bakersfield |
| Devin Rivers | IF | 2010-2011 | Tennessee Tech, Northwest Shoals CC |
| Frank Rivers | P | 2012-2012 | Grambling State |
| Griffin Rivers | OF-P | 2018-2020 | South Alabama, Pensacola State College, Austin Peay |
| Hunter Rivers | P | 2010-2014 | Jacksonville State |
| Kieton Rivers | 2B-SS | 2016-2019 | Coastal Carolina |
| Matt Rivers | P | 2020-2020 | Gardner-Webb |
| Ombri Rivers | IF-OF | 2010-2010 | Va Military Inst. |
| Tyren Rivers | OF | 2007-2010 | Radford |
| Weston Rivers | P | 2016-2018 | Indiana State, Lincoln Trail College |
| Brendan Rivoli | C | 2018-2020 | Virginia |
| Ryan Rizk | IF | 2018-2020 | Charleston Southern |
| Raul Rizo | P | 2017-2019 | Long Beach State, San Joaquin Delta College, Oklahoma Baptist |
| Cody Rizzo | C-3B | 2003-2006 | Notre Dame |
| Joe Rizzo | OF | 2004-2007 | St. Bonaventure |
| Nick Rizzo | 1B | 2010-2010 | Fairfield |
| Ralph Rizzo | IF | 2007-2011 | SUNY - Albany, Clarkson |
| Ryan Rizzo | OF | 2004-2007 | Quinnipiac |
| Matt Rizzuto | 2B | 2006-2009 | Gardner-Webb |
| 476 record(s) |