| | | Saturday, May 21st, 2005 | | Placed RF Olivier Jodoin on the Warren Cox League 10-day disabled list, retroactive to 05/12/2005. |
| Thursday, May 5th, 2005 | | Signed MR Lester Flux to a minor league contract extension. | | Signed 1B Yvan Dubé to a minor league contract extension. | | Signed 1B Brad Aramathal to a minor league contract extension. | | Signed C Raúl Solano to a minor league contract extension. | | Signed SS Clay Locke to a minor league contract extension. | | Signed SP Ed Young to a minor league contract extension. | | Signed 1B Chad Sacasian to a minor league contract extension. | | Signed 3B Rick Jones to a minor league contract extension. | | Signed CF Ron Martin to a minor league contract extension. |
| Tuesday, May 3rd, 2005 | | Signed free agent MR Richard Carey to a minor league contract. | | Signed free agent MR John Williams to a minor league contract. | | Signed free agent MR Su-hyeon Kim to a minor league contract. |
| Sunday, May 1st, 2005 | | Placed LF Tim Snow on the Charley Pegler League 10-day disabled list, retroactive to 04/26/2005. | | Released MR Michael Vreeland. |
| Friday, April 29th, 2005 | | Signed free agent MR Michael Vreeland to a 1-year contract worth a total of $450,000. |
| Saturday, April 23rd, 2005 | | Signed free agent MR Ernesto Terrón to a minor league contract. | | Signed free agent MR Armando Suárez to a minor league contract. |
| Wednesday, April 13th, 2005 | | Signed free agent 1B Gilberto Guerrero to a minor league contract. |
| Saturday, April 2nd, 2005 | | Signed free agent 1B Yvan Dubé to a minor league contract. |
| Sunday, March 6th, 2005 | | Signed MR Robert Durst to a 5-year contract extension worth a total of $13,850,000. |
| Wednesday, January 5th, 2005 | | Signed RF Nick Renner to a 2-year contract extension worth a total of $1,300,000. |
| Friday, December 31st, 2004 | | Signed free agent RF Nick Renner to a 1-year contract worth a total of $690,000. | | Signed free agent C Dan Shaw to a minor league contract. |
| Sunday, December 26th, 2004 | | Signed free agent 1B Brad Aramathal to a minor league contract. |
| Wednesday, December 22nd, 2004 | | Signed 2B Ken Dunbar to a minor league contract extension. | | Signed RF Norm Johnson to a minor league contract extension. |
| Tuesday, December 21st, 2004 | | Signed SP Qian-fu Qing to a minor league contract extension. | | Signed MR Wesley Patterson to a minor league contract extension. |
| Monday, December 20th, 2004 | | Signed MR Leonard Waterhouse to a minor league contract extension. | | Signed SP José Rivera to a minor league contract extension. | | Signed SP Bryant Morrow to a minor league contract extension. | | Signed CL Jesse Lambert to a minor league contract extension. |
| Sunday, December 19th, 2004 | | Signed free agent SP Ken Quinney to a 5-year contract worth a total of $23,200,000. |
| Monday, December 6th, 2004 | | Signed CF Tipper Kengos to a 8-year contract extension worth a total of $76,160,000. |
| Sunday, December 5th, 2004 | | Signed free agent 2B António Rodríguez to a minor league contract. |
| Thursday, December 2nd, 2004 | | Signed MR Ronald Maillet to a minor league contract extension. |
| Tuesday, November 30th, 2004 | | Signed 3B Allen Lemasters to a minor league contract extension. | | Signed free agent MR Jesse Lambert to a minor league contract. |
| Monday, November 29th, 2004 | | Signed MR Alejandro Puente to a minor league contract extension. | | Signed C Mun-wah Li to a minor league contract extension. | | Signed RF Augusto Zambrano to a minor league contract extension. |
| Sunday, November 28th, 2004 | | Signed RF Carlos Cruz to a minor league contract extension. | | Signed RF Charlie Green to a minor league contract extension. |
| Saturday, November 27th, 2004 | | Signed 1B Keith Neill to a minor league contract extension. | | Signed RF Olivier Jodoin to a minor league contract extension. | | Signed MR Pete Decker to a minor league contract extension. | | Signed SP Curt Bandelow to a minor league contract extension. | | Signed 1B Patrick Brown to a minor league contract extension. | | Signed MR Bryant Simpson to a minor league contract extension. | | Signed 2B Amaury Garcia to a minor league contract extension. |
| Sunday, November 21st, 2004 | | MR Stanley Price received a 1-year contract through automatic renewal worth a total of $300,000. | | 2B Ewan Olsen received a 1-year contract through arbitration worth a total of $892,500. | | MR Ralph Leslie received a 1-year contract through automatic renewal worth a total of $300,000. | | CF Bob Shallix received a 1-year contract through automatic renewal worth a total of $300,000. | | 3B Julius Cook received a 1-year contract through automatic renewal worth a total of $300,000. | | 3B Cris Guzmán received a 1-year contract through automatic renewal worth a total of $300,000. | | CL Albert Barnes becomes a free-agent. | | MR Ralph Hall becomes a free-agent. | | SP Sotaro Kato becomes a free-agent. | | MR Juan Hutchinson becomes a free-agent. |
| Thursday, November 18th, 2004 | | MR Ernest Powell received a 1-year contract through arbitration worth a total of $450,000. | | MR Gary Wilson received a 1-year contract through arbitration worth a total of $1,750,000. | | 1B Melvin Bradshaw received a 1-year contract through arbitration worth a total of $2,750,000. | | LF David Randolph received a 1-year contract through arbitration worth a total of $450,000. | | SP Bruce Tuck received a 1-year contract through arbitration worth a total of $979,625. |
| Tuesday, November 9th, 2004 | | Signed SP Ken Howell to a 2-year contract extension worth a total of $18,000,000. |
| Tuesday, November 2nd, 2004 | | Signed 3B Michael Reeve to a 2-year contract extension worth a total of $13,320,000. |
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