| Kasey Ko | 1B | 2006-2009 | Brigham Young |
| Ryan Kobbe | C | 2000-2002 | Marshall, Niagara |
| Alex Kobersteen | P | 2019-2020 | George Washington |
| Karl Kobler | OF | 2011-2011 | UC Davis, Laney College |
| Brian Kobliska | OF | 2000-2003 | Northern Iowa |
| Scott Kobos | P | 2016-2020 | UNC Asheville, St. Johns River CC, Coastal Carolina |
| Ty Kobylinski | IF-OF | 2015-2017 | George Washington, Louisburg College |
| Brian Koch | P | 2001-2002 | Creighton, Des Moines Area CC |
| Cody Koch | 1B | 2011-2014 | Kent State |
| Jared Koch | P | 2008-2010 | South Dakota State, North Iowa Area CC |
| Joe Koch | OF | 2009-2012 | Kent State |
| John Koch | P | 2010-2013 | Arkansas State |
| Logan Koch | C | 2014-2020 | South Carolina, Francis Marion, Spalding University |
| Ryan Koch | C-1B | 2016-2019 | Cal State Bakersfield, San Joaquin Delta College |
| Tyler Koch | P | 2017-2020 | Georgia State |
| Wes Koch | H | 1998-2001 | Lamar |
| Carl Kochan | H | 1998-1998 | Southern Illinois |
| Brett Kochanski | P | 2019-2020 | Canisius College |
| Ben Kocher | IF | 2015-2018 | Belmont |
| Kyler Kocher | P | 2016-2018 | MIT |
| Jake Kochmansky | OF | 2017-2020 | Lehigh |
| Shane Kochon | P | 2003-2003 | St. John's, Point Loma Nazarene |
| Greg Kocinski | IF | 2014-2018 | Marist |
| Garrett Kocis | 3B-P | 2018-2020 | Wichita State |
| Peter Kocur | P | 1999-2003 | Florida Intl |
| David Koczirka | P | 2008-2011 | Villanova |
| Julian Kodama | IF | 2019-2020 | Seattle |
| Jake Kodros | P | 2018-2020 | Rutgers, Southern New Hampshire |
| John Kodros | P | 2018-2020 | LSU, Texas Christian |
| Caleb Koedyker | OF | 2016-2017 | Texas-Arlington, Midland College, Lubbock Christian University |
| Dan Koegel | 1B | 2005-2008 | SUNY - Albany |
| Johnny Koegel | P | 2000-2003 | Air Force |
| Brett Koehler | P | 2010-2013 | William and Mary |
| Bryan Koehler | P | 1999-2002 | Navy |
| Ethan Koehler | P | 2017-2019 | Campbell, Seminole Florida, Valdosta State |
| Greg Koehler | P | 2007-2010 | North Florida |
| Henry Koehler | IF-OF | 2020-2020 | Davidson College |
| Joe Koehler | IF | 2013-2016 | Mercer, St. Petersburg College, Mount Olive College |
| Kincaid Koehler | P | 2010-2014 | Air Force, Montevallo |
| Michael Koehler | P | 2002-2005 | UC Irvine |
| Travis Koehler | P-1B | 2003-2003 | Wright State |
| Austin Koehn | P | 2019-2020 | UNC-Greensboro |
| John Koehnlein | OF | 2006-2009 | Youngstown State |
| Zair Koeiman | IF | 2013-2014 | Wichita State, Eastern Oklahoma State College |
| Spencer Koelewyn | P | 2018-2020 | Nebraska at Omaha |
| Clay Koelzer | C | 2017-2020 | Texas Tech, West Texas A&M |
| Kevin Koeneman | H | 2000-2003 | Western Illinois |
| Christian Koenig | P | 2006-2006 | Wright State, Findlay, Indiana Tech |
| Eric Koenig | IF | 2012-2015 | Seattle |
| Jake Koenig | IF | 2011-2012 | UNC Wilmington, Spartanburg Methodist College |
| Lucas Koenig | IF | 2010-2010 | Maryland-Eastern Shore |
| Michael Koenig | IF | 2016-2019 | South Florida, St. Johns River CC, Coastal Carolina |
| Ryan Koenig | P | 2009-2009 | Lamar, Eastfield College |
| Trevor Koenig | P | 2018-2020 | St. Cloud State |
| Ben Koenigsfeld | 1B-P | 2008-2011 | Army |
| Brandon Koenigstein | P | 2009-2012 | Creighton |
| Hunter Koep | P-1B | 2018-2019 | North Dakota State |
| Bob Koeppel | P-OF | 1970-1971 | Bradley |
| Cole Koeppel | P | 2020-2020 | Massachusetts |
| Matt Koerick | IF | 2006-2007 | Saint Joseph's, Portland |
| Matt Koerner | H | 2007-2007 | Arizona |
| Sterling Koerner | P-IF | 2014-2017 | Florida Gulf Coast |
| Trent Koerner | C | 2017-2020 | Saint Peter's, Chesapeake College |
| Joseph Koerper | IF | 2013-2016 | New Mexico State |
| Karl Koerper | 1B | 2019-2020 | New Mexico, Pima CC, Washington |
| Kristoffer Koerper | P | 2014-2014 | New Mexico State, Delta State, El Paso CC |
| Barrett Koerselman | IF | 2016-2016 | Sam Houston State |
| Joe Koessler | P | 2003-2006 | Navy |
| Logan Koester | P | 2020-2020 | George Washington |
| Mitch Koester | IF | 2001-2004 | Purdue |
| Russell Koesters | P | 2016-2018 | East Tennessee State |
| Carlisle Koestler | P | 2016-2020 | SE Louisiana, Hinds CC, Mississippi State |
| Benjamin Koff | P | 2016-2020 | South Florida, Central Florida CC |
| Scott Koffman | P | 2001-2003 | Brigham Young |
| Clint Kofmehl | P | 2001-2005 | Nevada |
| Cal Koga | C | 2016-2019 | San Jose State, William Jessup |
| Brandon Koger | 3B | 2003-2007 | Texas-San Antonio |
| Adam Koglin | IF | 2010-2011 | UNLV, Saint Xavier U. (Ill.), Chandler-Gilbert CC |
| Joe Kohan | IF | 2009-2012 | Nevada |
| Ryan Kohl | OF-IF | 2002-2002 | Eastern Illinois |
| Kyle Kohlberg | H | 1999-2000 | Southern Illinois |
| Gary Kohler | P | 2003-2004 | UNC Asheville, Tiffin |
| James Kohler | P | 2011-2014 | Evansville |
| Joe Kohler | P | 2006-2009 | Xavier |
| Jordan Kohler | IF | 2009-2010 | Indiana U.-Purdue U.-FW, Waubonsee CC |
| Logan Kohler | IF | 2020-2020 | Oklahoma |
| Tanner Kohlhepp | P-IF | 2019-2020 | Tennessee, Iowa Western CC |
| Grant Kohlstaedt | P | 2007-2008 | Illinois-Chicago, Kansas City CC |
| Jonathan Kohn | P | 2003-2006 | Southern, Chicago State |
| Michael Kohn | 1B | 2019-2020 | Quinnipiac |
| Rob Kohn | C | 2002-2004 | St. Mary's (CA) |
| Travis Kohn | P | 2004-2004 | Utah |
| Corey Kohnke | P | 2008-2009 | Pacific, Vanguard Southern California |
| Sam Kohnke | C | 2014-2015 | UW Milwaukee, UW Whitewater |
| Matt Kohorst | P | 2008-2012 | San Diego, Kansas |
| Josh Kohrs | P-DH | 2004-2005 | Louisiana-Lafayette, Central Missouri |
| Chase Koissian | OF | 2009-2013 | Hawaii, Cal Poly Pomona, Concordia |
| McKay Koissian | OF | 2014-2017 | Pacific |
| Mike Koitsopoulos | SS | 2002-2004 | Marshall, Pratt CC |
| Alex Koji | P | 2012-2014 | Florida Atlantic, Palm Beach State College |
| Chris Koken | IF | 2003-2003 | Rhode Island |
| Nick Koken | P | 2002-2004 | George Washington |
| Mason Kokodynski | UT | 2020-2020 | Loyola Marymount |
| John Kokol | 1B-P | 2000-2003 | Saint Joseph's |
| Zach Kokoska | OF-P | 2018-2020 | Virginia Tech, Kansas State |
| Steven Kokoski | C | 2018-2020 | Niagara, Saint Leo |
| Connor Kokx | OF | 2019-2020 | Long Beach State |
| Zack Kolakowski | IF | 2013-2017 | Illinois |
| Zenon Kolakowski | OF | 2012-2015 | Illinois-Chicago |
| Kye Kolar | IF | 2004-2004 | Virginia |
| Nick Kolarik | P | 2013-2015 | Indiana State, Johnson County CC |
| Kyle Kolb | C | 2003-2006 | Indiana State |
| Kodie Kolden | IF | 2019-2020 | Washington State |
| Matt Kole | UT | 2007-2010 | Austin Peay |
| Michael Kolesar | OF | 2018-2018 | Air Force |
| Jeff Kolhagen | 3B | 2002-2005 | Charleston Southern |
| Brett Koliani | P | 2011-2012 | Saint Joseph's |
| Keenan Kolinsky | P | 2010-2013 | Vanderbilt |
| David Koll | P | 2012-2015 | Bradley |
| Matt Kollas | UT | 2017-2017 | Portland |
| Clay Kollenbaum | P | 2009-2012 | Jacksonville |
| Andrew Kolmar | OF | 2008-2011 | Yale |
| Joe Kolodzey | OF | 2000-2002 | Delaware, Drexel |
| Zachary Kolodziejski | P | 2015-2018 | Niagara |
| Brett Kolomyjec | P | 2009-2009 | Dallas Baptist |
| Lucas Kolovitz | OF | 2020-2020 | Indiana U.-Purdue U.-FW |
| Jonathan Kolowich | H | 2008-2012 | Georgia State |
| Kash Koltermann | P | 2015-2019 | Hawaii, Bellevue CC |
| Tate Kolwyck | IF | 2019-2020 | Vanderbilt |
| Scott Komaromy | 1B-3B | 2002-2005 | Army |
| Bruce Kombrinck | P | 1971-1971 | Gulf Coast CC, South Alabama |
| Paul Komistek | OF-IF | 2020-2020 | Tennessee, Cincinnati |
| Phil Kommer | P | 2001-2001 | Eastern Michigan |
| Sean Kommerstad | OF | 2004-2007 | Minnesota |
| Josh Komnick | 3B | 2002-2002 | Coastal Carolina, John A. Logan College |
| Ben Komonosky | C | 2017-2020 | Evansville, North Iowa Area CC |
| Kevin Komstadius | 1B | 2009-2009 | Washington |
| Clay Konas | P | 2002-2005 | Gardner-Webb |
| Anthony Konders | P | 2013-2015 | Youngstown State, Los Angeles Harbor College |
| Kelvin Kondo | P | 2006-2006 | Chicago State |
| Kesley Kondo | P | 2011-2012 | Utah, West Los Angeles College |
| Nick Kondo | IF | 2017-2020 | SUNY - Albany |
| Hunter Konecny-Pena | IF | 2018-2020 | Pacific |
| Heath Konesheck | P | 2007-2008 | Stephen F. Austin, Angelina College |
| Philip Konieczny | IF | 2008-2011 | Pittsburgh |
| Clay Koniencki | C | 2016-2019 | Monmouth |
| Connor Konishi | OF | 2018-2020 | San Jose State |
| Bryce Konitzer | P | 2019-2020 | Illinois State, Madison Area Technical College |
| Sam Konnoff | IF-OF | 2010-2010 | Nicholls State, San Bernardino Valley College |
| Chris Kono | P | 2011-2014 | Holy Cross |
| Ryan Kono | IF | 2017-2017 | Cal State Bakersfield |
| Doug Konoske | P | 2005-2009 | Pepperdine |
| Tommy Konrad | P | 2011-2014 | Dayton |
| Kevin Konsler | OF | 2005-2008 | Illinois State, Elon |
| Stephen Konsler | IF | 2008-2009 | Dayton |
| Chris Kontos | IF | 2009-2012 | Northwestern |
| Colton Konvicka | SS-OF | 2013-2016 | Longwood |
| Wade Konvicka | P | 2011-2011 | Tulane, Alvin CC, Lamar |
| Mike Kool | P | 2008-2009 | Illinois-Chicago, Black Hawk College |
| Roel Koolen | 2B | 2003-2004 | Va. Commonwealth |
| Jared Koon | P | 2008-2008 | Mississippi State, Itawamba CC |
| Joseph Koon | P | 2011-2012 | SE Louisiana, Itawamba CC |
| Martin Koon | 1B | 2014-2014 | College of Charleston |
| Jacquez Koonce | OF | 2017-2020 | UNC-Greensboro, Gulf Coast CC |
| Tyler Koons | P | 2019-2020 | Eastern Michigan, Michigan at Dearborn |
| Nathan Koontz | OF | 2009-2010 | Ball State |
| Patrick Koontz | OF | 2011-2012 | UNC Asheville, Guilford College |
| Ryan Koopman | P | 2011-2014 | Campbell |
| Spencer Koopmans | P | 2012-2015 | UC Davis |
| Tyler Koors | P | 2009-2013 | Xavier |
| Jacob Koos | OF | 2016-2019 | Stetson |
| Kenny Kopacz | 3B | 2000-2003 | Saint Peter's |
| Justin Kopale | IF | 2010-2013 | Wright State |
| Daniel Kopas | P | 2012-2012 | Sacramento State |
| Devin Kopas | C | 2014-2017 | Portland |
| Dan Kopcak | P | 2012-2015 | Kent State |
| Josh Kopcza | P | 2018-2020 | Binghamton |
| Ryan Kopenski | P | 2014-2016 | Florida A&M, Central Florida CC |
| Blake Kopetsky | OF | 2013-2017 | Texas A&M, Temple College |
| Ryan Kopf | P | 2011-2011 | Michigan |
| Billy Kopicki | IF | 2020-2020 | Miami |
| Cody Kopilchack | P | 2010-2013 | Wright State |
| John Kopilchack | OF | 2005-2008 | Wright State |
| Kasey Koppelmaa | P | 2019-2019 | San Francisco |
| Chris Koppenhaver | P | 2017-2018 | Duke, Broward College, Tulane |
| Mason Koppens | IF-OF | 2015-2018 | Northeastern |
| Mike Koppersmith | P | 2005-2006 | South Alabama, Lurleen B. Wallace CC |
| Michael Koppin | SS | 2003-2003 | Old Dominion, Truett-McConnell College |
| Kevin Kopps | P | 2017-2020 | Arkansas |
| Hunter Kopycinski | C | 2013-2016 | Rice |
| Jordan Kopycinski | C | 2009-2010 | Texas State, Navarro College |
| Collin Korab | P | 2004-2006 | Illinois State |
| Kendall Korbal | P | 2008-2008 | Arkansas |
| Mike Korchak | P-1B | 2015-2018 | Bucknell |
| Brian Kordal | OF-1B | 2007-2010 | Akron |
| John Kordsmeier | P | 2010-2013 | Central Arkansas |
| Justin Korenblatt | P-OF | 2012-2015 | La Salle |
| Andy Korenek | SCOUT | 1975-1978 | Texas A&M |
| Tom Korenek | SCOUT | 1971-1971 | Texas A&M |
| Mike Korevec | P | 2008-2011 | Sacred Heart |
| Nathan Korff | P | 2004-2004 | Oakland |
| Kori Korinek | P | 2007-2007 | University at Buffalo, Cuyahoga CC |
| Kevin Korkate | P | 2010-2013 | Oakland |
| Patrick Korman | IF | 2015-2017 | South Dakota State |
| Mike Kornacker | P-IF | 2015-2019 | Purdue, Valparaiso |
| Zak Kornblum | P | 2011-2011 | UNC Wilmington, Louisburg College |
| Zach Kornely | P | 2016-2017 | Abilene Christian |
| Chase Kornemann | P | 2004-2008 | Delaware State, Mercer |
| Ross Korosec | P | 2018-2020 | South Florida, Rollins |
| Shaun Kort | IF-P | 2007-2010 | Nevada |
| Chase Kortan | OF | 2019-2020 | South Dakota State, Mount Marty College |
| Brian Korte | P | 2011-2014 | Indiana |
| Jeff Korte | C | 2015-2019 | Illinois, Eastern FL ST |
| Mike Korte | IF | 2013-2015 | Lipscomb, Indian River CC |
| Brett Korth | P | 2004-2004 | Western Kentucky, Kishwaukee College |
| Blake Korthauer | P | 2015-2015 | Texas-Arlington |
| Spencer Korus | IF-OF | 2008-2009 | Kentucky, Columbia Basin College |
| Sam Koruschak | SS | 2018-2020 | UNC-Greensboro, Polk State |
| Mike Korzeniewski | P | 2004-2004 | Duquesne, SUNY-Jamestown |
| Kevin Korzun | P | 2005-2006 | West Virginia, Potomac State College of WVU |
| Drew Korzybski | P | 2017-2018 | East Tennessee State |
| Nik Kosach | C-OF | 2003-2006 | Portland |
| David Kosakavich | P | 2015-2016 | New York Tech |
| Jason Kosakow | P | 2007-2008 | Stony Brook, Winthrop |
| Taylor Kosakowski | P | 2006-2009 | Central Ct State |
| Paul Kosanovich | P | 2018-2020 | Virginia, East Los Angeles College |
| Scott Koscho | C-OF | 2016-2017 | Navy |
| Brett Kosciolek | 1B-P | 2016-2016 | Rider |
| Keith Koser | P | 2011-2012 | Eastern Illinois, Wabash Valley College |
| Alex Koshgarian | OF | 2015-2019 | Central Ct State, Hudson Valley CC, College of Saint Rose |
| Rob Koski | C | 2015-2016 | Presbyterian College, Harford CC |
| James Kosky | P | 2003-2005 | Iona College |
| Nathan Koslowski | OF | 2013-2017 | Jacksonville |
| Paul Koslowski | P-1B | 2001-2004 | Northeastern, New Orleans |
| Nick Kosmetatos | IF | 2020-2020 | Butler |
| Scott Kosmicky | C | 2000-2003 | UMD-Baltimore Cty |
| Joey Kosowsky | P-IF | 2019-2020 | Fairleigh Dickinson |
| Vince Kossak | P | 2012-2013 | Miami, Palm Beach State College |
| Austin Kost | P | 2014-2017 | South Dakota State |
| Steve Kost | P | 2005-2008 | Washington State |
| Nick Kostalek | P | 2013-2015 | Chicago State, McHenry County College |
| Jon Jon Kostantis | P | 2019-2020 | Florida Atlantic |
| Brian Koster | IF | 2009-2012 | Saint Peter's |
| Garrett Koster | IF | 2009-2012 | Winthrop, Walters State CC, Elon |
| Robert Kostic | P | 2001-2004 | Wagner |
| Zach Kosturos | OF | 2002-2005 | Washington State, Edmonds CC, Nevada |
| John Koszulinski | C | 2008-2011 | Western Illinois |
| Kyle Kotchie | P | 2010-2011 | Texas-Pan American, Lake Sumter CC |
| J.J. Koterba | IF | 2004-2005 | Duke |
| Tom Kotis | OF | 2010-2011 | Northern Illinois, Madison Area Technical College |
| Brendan Kotler | OF | 2006-2008 | USC |
| Joe Kotler | P | 2013-2013 | Lehigh |
| Dakota Kotowski | OF-1B | 2019-2020 | Missouri State |
| James Kottaras | 2B | 2011-2011 | Connors State College, Bradley |
| Cody Kottich | C | 2013-2014 | Creighton, Garden City CC |
| Brad Kottman | P-1B | 2010-2012 | Brown, Rice |
| Joe Kotula | 3B-OF | 2003-2006 | Mount Saint Mary |
| Ryan Kotulek | P | 2017-2018 | Abilene Christian, Cisco Junior College |
| Ryan Kouba | IF-P | 2017-2020 | Austin Peay, Eastern Oklahoma State College |
| Andrew Koubek | P | 2007-2009 | Barry, Indian River CC |
| Matt Kougasian | IF | 2005-2008 | Hofstra |
| Josh Kougl | P | 2002-2003 | Cal Poly, Allan Hancock College |
| Harry Koulos | OF-C | 2008-2011 | Yale |
| Forrest Koumas | P | 2011-2015 | South Carolina, South Carolina-Aiken |
| Anes Koummal | IF | 2008-2009 | Quinnipiac |
| Steven Kouril | OF | 2009-2009 | Virginia |
| Chris Koutsavlis | P | 2003-2006 | Marshall |
| Clay Kovac | P | 2004-2008 | Michigan State, Indiana State |
| Chris Kovacevich | P | 2006-2010 | Coastal Carolina, Illinois-Chicago |
| Ron Kovach | P | 1977-1977 | Northern Colorado |
| Vaughn Kovach | P | 1965-1966 | West Virginia |
| Cam Kovachik | P | 2018-2020 | Duke, Villanova |
| Brian Kovacs | P | 2002-2003 | Toledo, Macomb CC |
| Owen Kovacs | P | 2020-2020 | East Tennessee State |
| Ryan Koval | OF | 2020-2020 | Wichita State, Pittsburg State |
| Carter Kovalcik | P | 2016-2018 | North Carolina Central |
| Conrad Kovalcik | C | 2014-2017 | North Carolina Central |
| Daniel Kovalcik | P | 2004-2007 | Navy |
| Cory Kovanda | IF | 2007-2010 | Ohio State |
| Benjamin Kovel | P | 2020-2020 | Fordham |
| TJ Kowalchuk | OF | 2002-2004 | Binghamton |
| Nick Kowalczuk | IF-OF | 2015-2016 | Michigan, Illinois State |
| Andrew Kowalo | IF | 2014-2017 | Liberty, Potomac State College of WVU |
| Chris Kowalski | 1B-P | 2007-2010 | Boston College |
| Drayven Kowalski | C | 2019-2020 | Longwood |
| Jon Kowalski | P | 2002-2004 | Michigan State |
| Justus Kowalski | 3B | 2012-2012 | Miss. Valley St |
| Brian Kownacki | IF | 2009-2012 | Fordham |
| Ross Kowzan | OF | 2002-2003 | Southern Illinois, SE ILL College |
| Dan Kozek | OF | 2004-2006 | Delaware |
| Matt Kozemchak | P-OF | 2014-2018 | Lehigh |
| Landon Kozeny | P | 2010-2011 | Stephen F. Austin, Brookhaven College |
| Jordan Kozicky | SS | 2017-2020 | Minnesota |
| Jason Koziol | P | 2006-2009 | Liberty, George Mason |
| Josh Koziol | P | 2005-2005 | Coppin State College |
| Kevin Koziol | C | 2017-2020 | St. Bonaventure, Erie CC |
| Mike Kozlowski | 1B | 2012-2013 | Murray State, John A. Logan College |
| Nick Kozlowski | P | 2012-2015 | Hofstra |
| CJ Kozorosky | OF | 2018-2020 | Mount Saint Mary |
| Josh Kozuch | C | 2007-2008 | Oakland, Saginaw Valley State |
| 300 record(s) |