Nationals Roster & Staff
Transactions
| Date | Transaction |
| 09/30/17 | Washington Nationals placed RHP Shawn Kelley on the 60-day disabled list. Bone chips in right elbow. |
| 09/30/17 | Washington Nationals activated SS Stephen Drew from the 60-day disabled list. |
| 09/27/17 | Washington Nationals signed free agent OF Diony Joseph to a minor league contract. |
| 09/26/17 | Washington Nationals activated RF Bryce Harper from the 10-day disabled list. |
| 09/08/17 | Washington Nationals recalled SS Adrian Sanchez from Syracuse Chiefs. |
| 09/07/17 | Washington Nationals recalled CF Andrew Stevenson from Syracuse Chiefs. |
| 09/07/17 | Washington Nationals recalled CF Rafael Bautista from Syracuse Chiefs. |
| 09/07/17 | Washington Nationals transferred RHP Erick Fedde from the 10-day disabled list to the 60-day disabled list. Right forearm flexor strain. |
| 09/07/17 | Washington Nationals selected the contract of Victor Robles from Harrisburg Senators. |
| 09/04/17 | Washington Nationals recalled C Pedro Severino from Syracuse Chiefs. |
| 09/04/17 | Washington Nationals placed RHP Erick Fedde on the 10-day disabled list. Right forearm flexor strain. |
| 09/04/17 | Washington Nationals recalled RHP A.J. Cole from Syracuse Chiefs. |
| 09/01/17 | Washington Nationals recalled RHP Erick Fedde from Syracuse Chiefs. |
| 09/01/17 | Washington Nationals recalled RHP Austin Adams from Syracuse Chiefs. |
| 09/01/17 | Washington Nationals recalled C Raudy Read from Harrisburg Senators. |
| 09/01/17 | Washington Nationals activated LHP Enny Romero from the 10-day disabled list. |
| 09/01/17 | Washington Nationals activated RHP Ryan Madson from the 10-day disabled list. |