| | | | | | | | | | |  | Major Transactions |
| | | | Thursday, September 16th, 1965 | | 1B W. Moon was designated for assignment and placed on waivers. |
| Thursday, September 2nd, 1965 | | Signed RF W. Herzog to a 1-year contract extension worth a total of $120,000. |
| Saturday, July 17th, 1965 | | Signed free agent MR T. Bowsfield to a 1-year contract worth a total of $200,000. |
| Friday, July 16th, 1965 | | Placed MR B. Faul on the 60-day disabled list. | | Purchased the contract of MR T. Fox from Triple A Denver. |
| Saturday, June 5th, 1965 | | Signed SP P. Regan to a 3-year contract extension worth a total of $870,000. |
| Wednesday, June 2nd, 1965 | | Signed free agent SS D. Buddin to a 1-year contract worth a total of $40,000. |
| Sunday, May 16th, 1965 | | MR R. Nischwitz was designated for assignment and placed on waivers. | | Purchased the contract of MR L. Bearnarth from Triple A Denver. |
| Wednesday, February 17th, 1965 | | Signed free agent SS R. McMillan to a 1-year contract worth a total of $40,000. |
| Tuesday, February 16th, 1965 | | Signed free agent LF W. Herzog to a 1-year contract worth a total of $65,000. |
| Monday, February 1st, 1965 | | Placed 1B F. Torre on the active roster. | | Placed 3B S. Nagashima on the active roster. |
| Wednesday, January 6th, 1965 | | Signed free agent 3B S. Nagashima to a 3-year contract worth a total of $2,450,000. |
| Saturday, January 2nd, 1965 | | Signed free agent 1B F. Torre to a 2-year contract worth a total of $450,000. |
| Tuesday, December 15th, 1964 | | Signed free agent MR R. Duren to a 1-year contract worth a total of $200,000. |
| Thursday, November 19th, 1964 | | 2B P. Gagliano received a 1-year contract through automatic renewal worth a total of $23,390. | | MR J. Purdin received a 1-year contract through automatic renewal worth a total of $23,390. | | SS J. Koppe becomes a free-agent. | | MR L. Bearnarth received a 1-year contract through automatic renewal worth a total of $23,390. | | SP J. Bunning becomes a free-agent. | | RF B. Morton received a 1-year contract through automatic renewal worth a total of $23,390. | | LF R. Colavito becomes a free-agent. | | CL B. Humphreys received a 1-year contract through automatic renewal worth a total of $23,390. | | RF P. Goldy received a 1-year contract through automatic renewal worth a total of $23,390. | | SP M. Lolich received a 1-year contract through automatic renewal worth a total of $23,390. | | MR G. Richardson received a 1-year contract through automatic renewal worth a total of $23,390. | | MR D. Gallagher received a 1-year contract through automatic renewal worth a total of $23,390. | | RF C. Maxwell becomes a free-agent. |
| Monday, November 16th, 1964 | | LF G. Alusik received a 1-year contract through arbitration worth a total of $29,491. | | 3B S. Boros received a 1-year contract through arbitration worth a total of $189,958. | | MR T. Fox received a 1-year contract through arbitration worth a total of $149,115. | | SP P. Regan received a 1-year contract through arbitration worth a total of $262,428. | | SP E. Fisher received a 1-year contract through arbitration worth a total of $185,885. | | 2B J. Wood received a 1-year contract through arbitration worth a total of $23,390. | | MR R. Nischwitz received a 1-year contract through arbitration worth a total of $101,568. | | MR F. Gladding received a 1-year contract through arbitration worth a total of $23,390. | | C M. Roarke received a 1-year contract through arbitration worth a total of $23,390. |
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