| | | | | | | | | | |  | Major Transactions |
| | | | Tuesday, August 16th, 1966 | | Placed SP B. Gibson on irrevocable waivers. |
| Monday, March 14th, 1966 | | Signed SP R. Washburn to a 4-year contract extension worth a total of $3,243,200. |
| Sunday, February 13th, 1966 | | Signed 1B B. White to a 2-year contract extension worth a total of $1,601,400. |
| Saturday, January 15th, 1966 | | Signed free agent SP E. Fisher to a 4-year contract worth a total of $3,197,200. |
| Wednesday, December 15th, 1965 | | Placed C J. Martin on the active roster. |
| Tuesday, December 14th, 1965 | | Signed free agent C J. Martin to a 2-year contract worth a total of $130,400. |
| Tuesday, November 16th, 1965 | | MR R. Wise received a 1-year contract through automatic renewal worth a total of $24,774. | | RF B. Burda received a 1-year contract through automatic renewal worth a total of $24,774. | | MR J. Ritchie received a 1-year contract through automatic renewal worth a total of $24,774. | | MR P. Cimino received a 1-year contract through automatic renewal worth a total of $24,774. | | RF T. Conigliaro received a 1-year contract through automatic renewal worth a total of $24,774. | | SP L. Jackson becomes a free-agent. | | MR B. Lee received a 1-year contract through automatic renewal worth a total of $24,774. | | SS S. Jackson received a 1-year contract through automatic renewal worth a total of $24,774. | | MR F. Bork received a 1-year contract through automatic renewal worth a total of $24,774. | | 1B M. Throneberry becomes a free-agent. | | RF D. Clemens received a 1-year contract through automatic renewal worth a total of $24,774. | | SP M. Stottlemyre received a 1-year contract through automatic renewal worth a total of $24,774. | | Purchased the contract of LF A. Ferrara from Triple A Atlanta. | | C J. Gonder was designated for assignment and placed on waivers. | | Placed CF C. Flood on the active roster. | | Activated CF C. Flood from the disabled list. | | Demoted SP R. Sadecki to Triple A Atlanta. |
| Saturday, November 13th, 1965 | | 3B M. Shannon received a 1-year contract through arbitration worth a total of $59,892. | | 2B R. Hunt received a 1-year contract through arbitration worth a total of $133,722. | | C J. Gonder received a 1-year contract through arbitration worth a total of $29,234. | | SP P. Toth received a 1-year contract through arbitration worth a total of $259,692. | | SP R. Washburn received a 1-year contract through arbitration worth a total of $458,880. | | 1B F. Whitfield received a 1-year contract through arbitration worth a total of $97,483. |
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