Nationals Roster & Staff
Transactions
| Date | Transaction |
| 07/31/16 | Washington Nationals activated RHP Mark Melancon. |
| 07/31/16 | Washington Nationals optioned RHP Reynaldo Lopez to Syracuse Chiefs. |
| 07/30/16 | Washington Nationals sent RHP Joe Ross on a rehab assignment to Syracuse Chiefs. |
| 07/30/16 | Washington Nationals traded LHP Felipe Rivero and LHP Taylor Hearn to Pittsburgh Pirates for RHP Mark Melancon. |
| 07/30/16 | Washington Nationals traded LHP Felipe Rivero and LHP Taylor Hearn to Pittsburgh Pirates for RHP Mark Melancon. |
| 07/30/16 | Washington Nationals recalled Reynaldo Lopez from Syracuse Chiefs. |
| 07/30/16 | Washington Nationals traded LHP Felipe Rivero and LHP Taylor Hearn to Pittsburgh Pirates for RHP Mark Melancon. |
| 07/29/16 | Washington Nationals recalled Pedro Severino from Syracuse Chiefs. |
| 07/29/16 | Washington Nationals placed C Jose Lobaton on the 15-day disabled list retroactive to July 20, 2016. Left elbow tendinitis. |
| 07/27/16 | Washington Nationals placed 2B Stephen Drew on the 15-day disabled list retroactive to July 24, 2016. Vertigo-like symptoms. |
| 07/27/16 | Washington Nationals recalled Wilmer Difo from Harrisburg Senators. |
| 07/26/16 | Washington Nationals activated 1B Ryan Zimmerman from the 15-day disabled list. |
| 07/25/16 | Washington Nationals optioned CF Michael Taylor to Syracuse Chiefs. |
| 07/25/16 | Washington Nationals optioned RHP Lucas Giolito to Syracuse Chiefs. |
| 07/25/16 | Washington Nationals activated LHP Sammy Solis from the 15-day disabled list. |
| 07/24/16 | Washington Nationals optioned RHP Koda Glover to Syracuse Chiefs. |
| 07/24/16 | Washington Nationals recalled Lucas Giolito from Syracuse Chiefs. |
| 07/23/16 | Washington Nationals sent LHP Nick Lee outright to Harrisburg Senators. |
| 07/22/16 | Washington Nationals sent LHP Sammy Solis on a rehab assignment to Potomac Nationals. |
| 07/22/16 | Washington Nationals signed free agent RHP Justin DeFratus to a minor league contract. |
| 07/21/16 | Washington Nationals sent 1B Ryan Zimmerman on a rehab assignment to Potomac Nationals. |
| 07/20/16 | Washington Nationals optioned RHP Reynaldo Lopez to Syracuse Chiefs. |
| 07/20/16 | Washington Nationals designated LHP Nick Lee for assignment. |
| 07/20/16 | Washington Nationals selected the contract of Koda Glover from Syracuse Chiefs. |
| 07/19/16 | Washington Nationals selected the contract of Reynaldo Lopez from Syracuse Chiefs. |
| 07/19/16 | Cincinnati Reds claimed RHP Abel De Los Santos off waivers from Washington Nationals. |
| 07/18/16 | Washington Nationals placed LHP Sammy Solis on the 15-day disabled list retroactive to July 8, 2016. Right knee. |
| 07/18/16 | Washington Nationals placed LHP Sammy Solis on the 15-day disabled list retroactive to July 8, 2016. Right knee inflammation. |
| 07/13/16 | Washington Nationals signed free agent SS Jose Sanchez to a minor league contract. |
| 07/12/16 | Los Angeles Angels traded RHP Matt Tindall to Washington Nationals for cash. |
| 07/08/16 | Washington Nationals placed 1B Ryan Zimmerman on the 15-day disabled list retroactive to July 7, 2016. Left rib cage strain. |
| 07/08/16 | Washington Nationals recalled Michael Taylor from Syracuse Chiefs. |
| 07/08/16 | Washington Nationals recalled SS Trea Turner from Syracuse Chiefs. |
| 07/08/16 | Washington Nationals optioned RHP Lucas Giolito to Syracuse Chiefs. |
| 07/05/16 | Washington Nationals signed free agent RHP Mark Blackmar to a minor league contract. |
| 07/04/16 | Washington Nationals optioned CF Michael Taylor to Syracuse Chiefs. |
| 07/04/16 | Washington Nationals activated RHP Jonathan Papelbon from the 15-day disabled list. |
| 07/03/16 | Washington Nationals activated RHP Stephen Strasburg from the 15-day disabled list. |
| 07/03/16 | Washington Nationals placed RHP Joe Ross on the 15-day disabled list. Right shoulder inflammation. |
| 07/03/16 | Washington Nationals signed free agent RHP Mat Latos to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Rafael Melendez to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent C Wilmer Perez to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent SS Luis Garcia to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Thony Amoroso to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent SS Yasel Antuna to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent C Ronaldy Sosa to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent C Israel Pineda to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent CF Ricardo Mendez to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Carlos Cuello to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Wilson Severino to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Niomar Gomez to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Johan Adon to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent C Kelvin Pacheco to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent SS Cesar Porte to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent C Luis Santana to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent OF David Escobar to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent RHP Eric Pena to a minor league contract. |
| 07/02/16 | Washington Nationals signed free agent OF Landerson Pena to a minor league contract. |
| 07/01/16 | Washington Nationals signed RHP Dane Dunning. |
| 07/01/16 | Washington Nationals signed LHP Hayden Howard. |