| Last updated: Sun, May 19, 2013, 15:24 EDT |
| Date | Player | Pos. | Transaction |
| 5/16 | Jhonatan Solano | C | Called Up from Minors |
| 5/16 | Wilson Ramos | C | Placed on 15-Day DL, (Left hamstring strain) |
| 5/15 | Jayson Werth | RF | Sent to Minors, For Rehabilitation |
| 5/11 | Eury Perez | CF | Called Up from Minors |
| 5/10 | Jayson Werth | RF | Placed on 15-Day DL, (Strained right hamstring) |
| 5/3 | Ryan Zimmerman | 3B | Removed From 15-Day DL, (Strained left hamstring) |
| 5/3 | Ryan Zimmerman | 3B | Recalled From Minors, Rehab Assignment |
| 5/2 | Anthony Rendon | 3B | Sent to Minors |
| 4/30 | Ryan Zimmerman | 3B | Sent to Minors, For Rehabilitation |
| 4/29 | Jhonatan Solano | C | Sent to Minors |
| 4/29 | Wilson Ramos | C | Removed From 15-Day DL, (Strained left hamstring) |
| 4/29 | Wilson Ramos | C | Recalled From Minors, Rehab Assignment |
| 4/26 | Wilson Ramos | C | Sent to Minors, For Rehabilitation |
| 4/23 | Xavier Cedeno | P | Sent to Minors |
| 4/23 | Xavier Cedeno | P | Acquired Off Waivers From, Houston |
| 4/21 | Anthony Rendon | 3B | Called Up from Minors |
| 4/21 | Ryan Zimmerman | 3B | Placed on 15-Day DL, (Strained left hamstring) |
| 4/14 | Wilson Ramos | C | Placed on 15-Day DL, (Strained left hamstring) |
| 4/14 | Jhonatan Solano | C | Called Up from Minors |
| 4/4 | Chris Young | P | Signed to a Minor League Contract |
| 3/26 | Chris Young | P | Released |
| 3/24 | Christian Garcia | P | Placed on 15-Day DL, (Strained right forearm tendon) |
| 3/22 | Cole Kimball | P | Sent to Minors |
| 3/22 | J.C. Romero | P | Signed to a Minor League Contract |
| 3/18 | Chris Snyder | C | Released |
| 3/18 | Jhonatan Solano | C | Sent to Minors |
| 3/18 | Ryan Perry | P | Sent to Minors |
| 3/18 | Yunesky Maya | P | Sent to Minors |
| 3/18 | Chris Marrero | 1B | Sent to Minors |
| 3/18 | Corey Brown | LF | Sent to Minors |
| 3/14 | Sandy Leon | C | Sent to Minors |
| 3/14 | Eury Perez | CF | Sent to Minors |
| 3/9 | Will Ohman | P | Released |
| 2/21 | Chris Young | P | Signed to a Minor League Contract |
| 2/15 | Jordan Zimmermann | P | Signed, ( 2013)(avoids arbitration) |
| 2/13 | Mike Crotta | P | Signed to a Minor League Contract |
| 2/11 | Will Ohman | P | Signed to a Minor League Contract |
| 2/6 | Micah Owings | P | Signed to a Minor League Contract |
| 2/5 | Jeremy Accardo | P | Signed to a Minor League Contract |
| 2/5 | Chris Snyder | C | Signed to a Minor League Contract |
| 1/27 | Jerad Head | LF | Signed to a Minor League Contract |
| 1/18 | Craig Stammen | P | Signed, ( 2013-2014)(two-year contract, avoids arbitration) |
| 1/18 | Ross Detwiler | P | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Ian Desmond | SS | Signed, ( 2013)(avoids arbitration) |
| 1/18 | Roger Bernadina | LF | Signed, ( 2013)(avoids arbitration) |
| 1/17 | Rafael Soriano | P | Signed as Free Agent, ( 2013-2014; Opt 2015)(two-year contract) |
| 1/17 | Drew Storen | P | Signed, ( 2013)(avoids arbitration) |
| 1/14 | Delwyn Young | RF | Signed to a Minor League Contract |
| 1/10 | Sean West | P | Signed to a Minor League Contract |
| 1/10 | Ross Ohlendorf | P | Signed to a Minor League Contract |
| 1/8 | Adam LaRoche | 1B | Signed as Free Agent, ( 2013-2014; Opt 2015)(two-year contract) |
| 12/28 | Mike Costanzo | 1B | Signed to a Minor League Contract |
| 12/13 | Brian Bocock | SS | Signed to a Minor League Contract |
| 12/10 | Dan Haren | P | Signed as Free Agent, ( 2013)(one-year contract) |
| 12/7 | Dan Haren | P | Signed as Free Agent, ( 2013)(one-year contract) |
| 12/3 | Bill Bray | P | Signed to a Minor League Contract |
| 12/3 | Zach Duke | P | Signed to a Minor League Contract |
| 12/2 | Brad Lidge | P | Retired |
| 11/30 | John Lannan | P | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/30 | Tom Gorzelanny | P | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/30 | Jesus Flores | C | Not Offered Contract and Became Free Agent, (non-tendered) |
| 11/29 | Denard Span | CF | Traded From, Minnesota (for RHP Alex Meyer) |
| 11/21 | Fernando Abad | P | Signed to a Minor League Contract |
| More Transactions |
