| 54 | Juan Acevedo | OF | RK | 6-2 | 200 | Both | Right | 8/4/1981 | 21 | Paya Bani,Dominican Republic | 1999 | UDFA | | CIN |
|
| 5 | Rusty Beale | SS | RK | 6-1 | 175 | Right | Right | 10/21/1980 | 22 | | 2003 | 45 | 1334 | CIN |
| 15 | Carlos Bohorquez | P | AA | 5-11 | 160 | Right | Right | 10/6/1981 | 21 | Maracaibo,Venezuela | 1999 | UDFA | | CIN |
| 7 | Luis Bolivar | 2B | AAA | 6-1 | 150 | Both | Right | 2/15/1981 | 22 | Aragua,Venezuela | 1999 | UDFA | | SD |
| 47 | Walin Cabrera | P | AAA | 6-0 | 190 | Right | Right | 3/28/1982 | 21 | Altamira,Dominican Republic | 1999 | UDFA | | CLE |
| 19 | Troy Cairns | SS | AAA | 6-0 | 160 | Right | Right | 9/29/1980 | 22 | St. Paul,Minnesota | 2002 | 46 | 1358 | CIN |
| 7 | Tiago Campos | OF | A | 6-2 | 170 | Right | Right | 3/18/1981 | 22 | Sao Paulo,Brazil | 2000 | UDFA | | CIN |
| 54 | Clay Cleveland | 1B | RK | 6-4 | 250 | Right | Right | 9/21/1980 | 22 | Birmingham,Alabama | 2003 | 39 | 1161 | CIN |
| 44 | Chris Dickerson | 2B | MLB | 6-4 | 212 | Left | Left | 4/10/1982 | 21 | Hollywood,California | 2003 | 16 | 471 | CIN |
| 16 | Orlando Escorcha | P | RK | 6-2 | 170 | Left | Left | 1/20/1982 | 21 | Guacara,Venezuela | 1999 | UDFA | | CIN |
| 9 | Phil Gentry | OF | A+ | 5-11 | 195 | Left | Right | 9/2/1980 | 22 | Little Rock,Arkansas | 2003 | 29 | 861 | CIN |
| 23 | Jon George | P | AA | 6-3 | 210 | Right | Right | 7/6/1984 | 18 | Voorhees,New Jersey | 2002 | 16 | 465 | CIN |
| 27 | Jeff Groeger | P | RK | 6-5 | 220 | Right | Right | 9/5/1980 | 22 | La Mirada,California | 2002 | UDFA | | CIN |
| 21 | Carlos Guevara | P | MLB | 6-0 | 175 | Right | Right | 3/18/1982 | 21 | Uvalde,Texas | 2003 | 7 | 201 | CIN |
| 2 | Tonys Gutierrez | 1B | AA | 6-2 | 180 | Left | Left | 8/18/1983 | 19 | Cagua,Venezuela | 2000 | UDFA | | CIN |
| 34 | Derek Hawk | P | A | 6-6 | 225 | Left | Right | 11/13/1982 | 20 | Fort Bragg,California | 2002 | 43 | 1275 | CIN |
| 34 | Blake Hendley | P | A+ | 6-3 | 195 | Right | Right | 9/1/1981 | 21 | Enid,Oklahoma | 2003 | 11 | 321 | CIN |
| 4 | Habelito Hernandez | 2B | A+ | 6-0 | 180 | Right | Right | 1/11/1981 | 22 | Bonao,Dominican Republic | 2002 | UDFA | | CIN |
| 26 | Ben Himes | OF | A+ | 6-4 | 210 | Left | Right | 3/9/1981 | 22 | Austin,Texas | 2003 | 9 | 261 | CIN |
| - | Will Hudson | 2B | A+ | 6-1 | 190 | Both | Right | 1/26/1981 | 22 | Fountain Valley,California | 2002 | 20 | 597 | NYM |
| 29 | Justin Knoff | P | AA | 6-4 | 205 | Right | Right | 6/22/1981 | 22 | Willingboro,New Jersey | 2002 | 30 | 885 | CIN |
| - | Julio Medina | P | AAA | 6-3 | 180 | Right | Right | 4/25/1983 | 20 | Celaya,Mexico | 2001 | 32 | 955 | KC |
| 21 | Calvin Medlock | P | AAA | 5-10 | 195 | Right | Right | 11/8/1982 | 20 | Houston,Texas | 2002 | 39 | 1155 | CIN |
| 59 | Robert Mosby | 1B-OF | A | 6-3 | 240 | Right | Right | 4/9/1982 | 21 | Centerville,Illinois | 2002 | 25 | 735 | CIN |
| 39 | Rafael Motooka | C | AA | 6-0 | 170 | Right | Right | 8/18/1982 | 20 | Sao Paulo,Brazil | 2000 | UDFA | | CIN |
| 57 | Walter Olmstead | 1B | A+ | 6-6 | 230 | Both | Right | 12/5/1980 | 22 | San Antonio,Texas | 2002 | 6 | 165 | CIN |
| 36 | Jim Paduch | P | AAA | 6-3 | 210 | Right | Right | 11/2/1982 | 20 | Chicago,Illinois | 2003 | 12 | 351 | CIN |
| 34 | Manuel Paula | OF | A | 6-2 | 190 | Right | Right | 1/25/1981 | 22 | San Francisco de Macoris,Dominican Republic | 1998 | UDFA | | CIN |
| 37 | Miguel Perez | C | MLB | 6-3 | 190 | Right | Right | 9/25/1983 | 19 | Guatire,Venezuela | 2000 | UDFA | | CIN |
| 3 | Ivan Reyes | 3B | AA | 6-2 | 185 | Right | Right | 6/6/1981 | 22 | Bayamon,Puerto Rico | 1998 | 4 | 127 | NYY |
| 4 | Jose Ronda | SS | RK | 6-2 | 175 | Both | Right | 6/8/1985 | 18 | San Juan,Puerto Rico | 2003 | 3 | 81 | CIN |
| 22 | David Shafer | P | AAA | 6-3 | 170 | Right | Right | 3/7/1982 | 21 | Flagstaff,Arizona | 2001 | 32 | 966 | CIN |
| 23 | Kyle Smith | OF | A+ | 6-2 | 205 | Right | Right | 5/17/1981 | 22 | Houston,Texas | 2003 | 18 | 531 | CIN |
| 52 | Greg Talamantez | P | AA | 6-2 | 215 | Right | Right | 10/17/1965 | 37 | Idaho Falls,Idaho | 1984 | 3 | 79 | BAL |
| 12 | Brock Till | P | AAA | 6-0 | 200 | Right | Right | 7/1/1980 | 22 | Macomb,Illinois | 2003 | 17 | 501 | CIN |
| 56 | Matt Trepkowski | P | RK | 6-6 | 235 | Left | Left | 4/1/1981 | 22 | Bay City,Michigan | 2003 | 35 | 1041 | CIN |
| 41 | Jeff Urgelles | C | AA | 6-1 | 200 | Right | Right | 9/19/1982 | 20 | Miami,Florida | 2003 | 26 | 771 | CIN |
| 18 | Damian Ursin | P | A | 6-0 | 197 | Right | Right | 11/27/1982 | 20 | Gramercy,Louisiana | 2003 | 8 | 231 | CIN |
| 11 | Camilo Vazquez | P | AAA | 6-0 | 180 | Left | Left | 10/3/1983 | 19 | Havana,Cuba | 2002 | 4 | 105 | CIN |
| 46 | Joey Votto | 1B | MLB | 6-3 | 200 | Left | Right | 9/10/1983 | 19 | Toronto,Ontario | 2002 | 2 | 44 | CIN |
| 19 | Corey Wachman | P | RK | 6-0 | 180 | Right | Right | 10/16/1980 | 22 | Colorado Springs,Colorado | 2002 | 7 | 195 | CIN |
| 17 | Mark Wells | P | AA | 6-4 | 190 | Right | Right | 6/14/1980 | 23 | Charlotte,North Carolina | 2002 | UDFA | | CIN |
| 24 | Chad Ziemendorf | C | A | 5-10 | 190 | Right | Right | 4/9/1981 | 22 | San Jose,California | 2003 | 23 | 681 | CIN |