Nationals Roster & Staff
Transactions
| Date | Transaction |
| 07/31/11 | Washington Nationals recalled Atahualpa Severino from Syracuse Chiefs. |
| 07/31/11 | Washington Nationals optioned Yunesky Maya to Syracuse Chiefs. |
| 07/30/11 | Washington Nationals recalled Yunesky Maya from Syracuse Chiefs. |
| 07/30/11 | Washington Nationals recalled Brian Bixler from Syracuse Chiefs. |
| 07/30/11 | South Bend Silver Hawks Traded SS Zach Walters to Potomac Nationals and Washington Nationals Traded RHP Jason Marquis to Arizona Diamondbacks. |
| 07/30/11 | Huntsville Stars Traded RF Erik Komatsu to Harrisburg Senators and Washington Nationals Traded SS Jerry Hairston to Milwaukee Brewers. |
| 07/29/11 | Washington Nationals activated RHP Chien-Ming Wang from the 60-day disabled list. |
| 07/29/11 | Washington Nationals optioned RF Roger Bernadina to Syracuse Chiefs. |
| 07/28/11 | SS Junior Geraldo assigned to DSL Nationals from Washington Nationals. |
| 07/28/11 | Washington Nationals signed RHP Cody Davis. |
| 07/27/11 | Washington Nationals designated 1B Matt Stairs for assignment. |
| 07/27/11 | Washington Nationals signed SS Junior Geraldo. |
| 07/26/11 | Cincinnati Reds Traded LF Jonny Gomes to Washington Nationals; Hagerstown Suns Traded LHP Chris Manno to Dayton Dragons and Harrisburg Senators Traded OF Bill Rhinehart to Carolina Mudcats. |
| 07/24/11 | Washington Nationals signed free agent LF Leonard Davis to a minor league contract. |
| 07/22/11 | Dixon Anderson assigned to GCL Nationals from Washington Nationals. |
| 07/22/11 | Washington Nationals signed OF Billy Burns. |
| 07/22/11 | Washington Nationals signed free agent RHP Maximo Valerio to a minor league contract. |
| 07/21/11 | John Peters assigned to GCL Nationals from Washington Nationals. |
| 07/21/11 | RHP Scott Williams assigned to GCL Nationals from Washington Nationals. |
| 07/21/11 | Washington Nationals released RHP Chad Gaudin. |
| 07/20/11 | Washington Nationals signed free agent RHP John Peters to a minor league contract. |
| 07/20/11 | Washington Nationals signed RHP Scott Williams. |
| 07/19/11 | Washington Nationals designated RHP Chad Gaudin for assignment. |
| 07/18/11 | Jerry Hairston roster status changed by Washington Nationals. |
| 07/18/11 | Washington Nationals optioned Brian Bixler to Syracuse Chiefs. |
| 07/14/11 | RHP Jesus De Los Santos assigned to DSL Nationals from Washington Nationals. |
| 07/14/11 | Washington Nationals signed RHP Dixon Anderson. |
| 07/14/11 | Washington Nationals signed RHP Taylor Hill. |
| 07/08/11 | Washington Nationals recalled C Jesus Flores from Syracuse Chiefs. |
| 07/08/11 | Washington Nationals signed free agent RHP Algenis Ramirez to a minor league contract. |
| 07/07/11 | Washington Nationals optioned Collin Balester to Syracuse Chiefs. |
| 07/07/11 | Washington Nationals placed C Ivan Rodriguez on the 15-day disabled list. Strained right oblique. |
| 07/05/11 | Washington Nationals recalled LHP Ross Detwiler from Syracuse Chiefs. |
| 07/05/11 | Washington Nationals designated Collin Balester for assignment. |
| 07/01/11 | Washington Nationals placed SS Jerry Hairston on the 15-day disabled list retroactive to June 30, 2011. Right wrist fracture. |
| 07/01/11 | Washington Nationals activated CF Rick Ankiel from the 15-day disabled list. |