| 14 | David Aardsma | P | MLB | 6-5 | 200 | Right | Right | 12/27/1981 | 21 | Denver,Colorado | 2003 | 1 | 22 | SF |
|
| 20 | Josh Baker | P | A+ | 6-5 | 220 | Right | Right | 4/2/1982 | 21 | Houston,Texas | 2004 | 4 | 106 | MIL |
| 12 | Jeff Blackinton | IF-P | NCAA | 6-2 | 200 | Right | Right | 9/4/1981 | 21 | Honolulu,Hawaii | | UDFA | | |
| 16 | Dane Bubela | OF | A | 5-10 | 190 | Left | Right | 5/31/1980 | 23 | Houston,Texas | 2003 | 22 | 646 | TEX |
| 3 | Matt Cavanaugh | IF | NCAA | 6-2 | 170 | Right | Right | 12/16/1983 | 19 | Houston,Texas | | UDFA | | |
| 13 | Enrique Cruz | 2B | AA | 5-10 | 185 | Both | Right | 7/13/1981 | 21 | Houston,Texas | 2003 | 14 | 424 | NYY |
| 9 | Austin Davis | OF-IF | NCAA | 5-10 | 170 | Left | Right | 8/21/1982 | 20 | Greenwich,Connecticut | | UDFA | | |
| 35 | Lyndon Duplessis | C | NCAA | 6-0 | 190 | Right | Right | 8/15/1983 | 19 | Houston,Texas | | UDFA | | |
| 2 | Matt Emerson | H | NCAA | | | | | | - | | | UDFA | | |
| 29 | Jon Gillespie | C | NCAA | 5-11 | 200 | Right | Right | 1/4/1983 | 20 | Spirit Lake,Iowa | | UDFA | | |
| 34 | Steven Herce | P | A- | 6-3 | 220 | Right | Right | 3/23/1981 | 22 | Houston,Texas | 2003 | 17 | 495 | PIT |
| 1 | Sean Hirsch | IF | NCAA | 5-10 | 175 | Right | Right | 6/24/1982 | 21 | Tarzana,California | | UDFA | | |
| 21 | Philip Humber | P | MLB | 6-4 | 210 | Right | Right | 12/21/1982 | 20 | Nacogdoches,Texas | 2004 | 1 | 3 | NYM |
| 11 | Paul Janish | SS | MLB | 6-2 | 180 | Right | Right | 10/12/1982 | 20 | Cypress,Texas | 2004 | 5 | 138 | CIN |
| 4 | Jeff Jorgensen | OF | NCAA | 5-11 | 185 | Right | Right | 2/1/1981 | 22 | Houston,Texas | 2003 | 7 | 209 | HOU |
| 7 | Chris Kolkhorst | OF | A+ | 5-9 | 180 | Left | Right | 3/7/1982 | 21 | Houston,Texas | 2004 | 10 | 282 | SD |
| 24 | Colin Matheny | P | NCAA | 6-1 | 175 | Right | Left | 10/15/1983 | 19 | New Haven,Connecticut | | UDFA | | |
| 15 | Matt Moake | IF | NCAA | 5-10 | 150 | Right | Right | 10/13/1982 | 20 | Boston,Massachusetts | | UDFA | | |
| 33 | Jeff Niemann | P | MLB | 6-9 | 260 | Right | Right | 2/28/1983 | 20 | Houston,Texas | 2004 | 1 | 4 | TB |
| 10 | Lance Pendleton | P | MLB | 6-3 | 195 | Left | Right | 9/10/1983 | 19 | Kingwood,Texas | 2005 | 4 | 139 | NYY |
| 8 | Marcos Ramos | P | NCAA | 5-9 | 150 | Left | Left | 2/28/1983 | 20 | Austin,Texas | | UDFA | | |
| 19 | Justin Ruchti | C | AA | 6-2 | 200 | Right | Right | 12/11/1980 | 22 | Houston,Texas | 2003 | 9 | 266 | SEA |
| 27 | Vince Sinisi | 1B | AAA | 6-0 | 195 | Left | Left | 11/7/1981 | 21 | Houston,Texas | 2003 | 2 | 46 | TEX |
| 5 | Drew Skaggs | IF-OF | NCAA | 5-11 | 190 | Right | Right | 9/5/1979 | 23 | Houston,Texas | | UDFA | | |
| 23 | Craig Stansberry | 3B-2B | MLB | 6-0 | 185 | Right | Right | 3/8/1982 | 21 | Dammam,Saudi Arabia | 2003 | 5 | 135 | PIT |
| 30 | Wade Townsend | P | AA | 6-4 | 230 | Right | Right | 2/22/1983 | 20 | Austin,Texas | 2005 | 1 | 8 | TB |
| 22 | Matt Ueckert | P-IF | NCAA | 6-5 | 240 | Left | Left | 3/8/1984 | 19 | Houston,Texas | | UDFA | | |