January 14, 2015
Tyler Clippard
traded from
Nationals 
to
Athletics
January 21, 2015
Nationals
sign
Max Scherzer
as a free agent
February 28, 2015
March 30, 2015
Sandy Leon
traded from
Nationals
to
Red Sox
April 05, 2015
Nationals
place
Anthony Rendon
on the injured list
April 15, 2015
Nationals
place
Craig Stammen
on the injured list
May 30, 2015
Nationals
place
Stephen Strasburg
on the injured list
June 11, 2015
Nationals
place
Ryan Zimmerman
on the injured list
June 14, 2015
Trea Turner
traded from
Padres
to
Nationals
June 25, 2015
Nationals
sign
Andrew Stevenson
Nationals
sign
Taylor Hearn
June 26, 2015
Nationals
place
Anthony Rendon
on the injured list
June 30, 2015
Nationals
sign
Max Schrock
July 02, 2015
July 05, 2015
Nationals
place
Stephen Strasburg
on the injured list
July 17, 2015
Nationals
sign
Connor Overton
July 28, 2015
Nick Pivetta
traded from
Nationals
to
Phillies
November 02, 2015
Jordan Zimmermann
became a free agent
November 21, 2015
Nationals
sign
Adrian Sanchez
December 02, 2015
Craig Stammen
became a free agent
December 10, 2015
Trevor Gott
traded from
None
to
Nationals
December 11, 2015
Nationals
sign
Oliver Perez
as a free agent
December 14, 2015
Nationals
sign
Yusmeiro Petit
as a free agent