| | | | | | | | | | |  | Major Transactions |
| | | | Tuesday, June 1st, 1965 | | Placed SP E. Broglio on the 60-day disabled list. | | Purchased the contract of MR R. Kline from Triple A Atlanta. |
| Tuesday, May 4th, 1965 | | Signed SP R. Sadecki to a 3-year contract extension worth a total of $977,600. |
| Monday, May 3rd, 1965 | | Signed SS J. Javier to a 2-year contract extension worth a total of $70,000. |
| Saturday, April 17th, 1965 | | Signed CL L. McDaniel to a 3-year contract extension worth a total of $1,251,000. |
| Thursday, April 15th, 1965 | | Signed CF C. Flood to a 3-year contract extension worth a total of $1,847,200. |
| Wednesday, February 17th, 1965 | | Signed free agent C J. Roseboro to a 2-year contract worth a total of $208,400. |
| Wednesday, November 25th, 1964 | | Placed SP M. Stottlemyre on the active roster. | | C J. Schaffer was designated for assignment and placed on waivers. | | CF C. Warwick was designated for assignment and placed on waivers. |
| Thursday, November 19th, 1964 | | MR R. Wise received a 1-year contract through automatic renewal worth a total of $23,390. | | MR J. Ritchie received a 1-year contract through automatic renewal worth a total of $23,390. | | 3B M. Shannon received a 1-year contract through automatic renewal worth a total of $23,390. | | 2B R. Hunt received a 1-year contract through automatic renewal worth a total of $23,390. | | RF T. Conigliaro received a 1-year contract through automatic renewal worth a total of $23,390. | | MR B. Lee received a 1-year contract through automatic renewal worth a total of $23,390. | | LF A. Ferrara received a 1-year contract through automatic renewal worth a total of $23,390. | | SS S. Jackson received a 1-year contract through automatic renewal worth a total of $23,390. | | MR F. Bork received a 1-year contract through automatic renewal worth a total of $23,390. | | Traded 30-year old right fielder R. Maris to the California Angels, getting 23-year old starting pitcher M. Stottlemyre in return. |
| Monday, November 16th, 1964 | | C J. Gonder received a 1-year contract through arbitration worth a total of $36,542. | | SS J. Javier received a 1-year contract through arbitration worth a total of $23,390. | | SP R. Sadecki received a 1-year contract through arbitration worth a total of $265,300. | | SP P. Toth received a 1-year contract through arbitration worth a total of $148,902. | | SP R. Washburn received a 1-year contract through arbitration worth a total of $325,242. | | 1B F. Whitfield received a 1-year contract through arbitration worth a total of $121,854. | | SS J. Gotay received a 1-year contract through arbitration worth a total of $23,390. |
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