| | | Tuesday, September 19th, 1972 | | Signed SP C. Upshaw to a 2-year contract extension worth a total of $6,140,000. |
| Tuesday, August 1st, 1972 | | Traded 33-year-old third baseman P. Ward and 25-year-old reliever J. Decker to the Chicago Colts, getting a 3rd round draft pick, a 2nd round draft pick and a 4th round draft pick in return. |
| Sunday, July 16th, 1972 | | Traded 39-year-old second baseman E. Charles and a 3rd round draft pick to the Washington Monuments, getting 23-year-old minor league starting pitcher M. Nagy, a 2nd round draft pick and a 3rd round draft pick in return. | | Traded 32-year-old third baseman R. Santo, 31-year-old shortstop R. Hunt, a 4th round draft pick and $3,800,000 in cash to the Los Angeles Outlaws, getting 27-year-old closer K. Tatum, 26-year-old third baseman B. Melton and 26-year-old third baseman B. Grabarkewitz in return. | | Placed 3B B. Grabarkewitz on the 15-day disabled list. |
| Thursday, May 18th, 1972 | | Signed 2B R. Hunt to a 3-year contract extension worth a total of $19,020,000. |
| Wednesday, March 1st, 1972 | | Drafted C C. Fisk in the 1972 first-year player draft (Round 1, Pick 3, 3rd overall Pick). | | Traded 31-year-old minor league reliever J. Aker, 35-year-old minor league second baseman B. Johnson and 28-year-old minor league catcher J. Hiatt to the St. Louis Maroons, getting 28-year-old first baseman M. Hegan in return. | | Drafted LF D. Baker in the 1972 first-year player draft (Round 1, Pick 12, 12th overall Pick). | | Drafted MR D. Stanhouse in the 1972 first-year player draft (Round 4, Pick 8, 44th overall Pick). | | Drafted SP R. Harrison in the 1972 first-year player draft (Round 5, Pick 3, 51st overall Pick). |
| Saturday, February 19th, 1972 | | Signed free agent 3B E. Charles to a 1-year contract worth a total of $1,610,000. |
| Saturday, February 12th, 1972 | | Signed free agent RF W. Horton to a 2-year contract worth a total of $1,460,000. |
| Sunday, February 6th, 1972 | | Signed free agent LF R. Swoboda to a 1-year contract worth a total of $520,000. | | Signed free agent 1B B. Robertson to a 1-year contract worth a total of $300,000. |
| Monday, November 1st, 1971 | | MR J. Bouton received a 1-year contract through automatic renewal worth a total of $300,000. | | SP M. Lolich received a 1-year contract through automatic renewal worth a total of $1,000,000. | | 3B A. Gallagher received a 1-year contract through automatic renewal worth a total of $300,000. | | SP P. Niekro received a 1-year contract through automatic renewal worth a total of $2,000,000. | | CL C. Upshaw received a 1-year contract through automatic renewal worth a total of $2,000,000. | | RF J. Holt received a 1-year contract through automatic renewal worth a total of $300,000. | | LF D. Baylor received a 1-year contract through automatic renewal worth a total of $300,000. | | C E. Rodriguez received a 1-year contract through automatic renewal worth a total of $300,000. | | SP T. Seaver received a 1-year contract through automatic renewal worth a total of $2,200,000. | | SP J. Horlen received a 1-year contract through automatic renewal worth a total of $400,000. | | MR B. Capra received a 1-year contract through automatic renewal worth a total of $300,000. | | 1B S. Garvey received a 1-year contract through automatic renewal worth a total of $1,000,000. | | SS L. Bowa received a 1-year contract through automatic renewal worth a total of $300,000. | | SP J. Nash received a 1-year contract through automatic renewal worth a total of $1,500,000. | | C E. Williams received a 1-year contract through automatic renewal worth a total of $300,000. | | SP D. Gullett received a 1-year contract through automatic renewal worth a total of $300,000. | | SP K. Brett received a 1-year contract through automatic renewal worth a total of $300,000. | | Traded a 1st round draft pick and a 2nd round draft pick to the Los Angeles Outlaws, getting 30-year-old shortstop R. Hunt, a 1st round draft pick and a 2nd round draft pick in return. |
| Friday, October 29th, 1971 | | 2B B. Johnson received a 1-year contract through arbitration worth a total of $450,000. | | MR D. Drott received a 1-year contract through arbitration worth a total of $450,000. | | MR J. Ritchie received a 1-year contract through arbitration worth a total of $950,000. |
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