Offseason
- October 14, 1963: Minnie Miñoso was released by the Senators.
- November 30, 1963: Marshall Bridges was purchased by the Senators from the New York Yankees.
- December 2, 1963: Howie Koplitz was drafted by the Senators from the Detroit Tigers in the 1963 rule 5 draft.
- December 6, 1963: Bill Skowron was purchased by the Senators from the Los Angeles Dodgers.
- December 6, 1963: Hobie Landrith was released by the Senators.
- March 31, 1964: The Senators traded a player to be named later to the Baltimore Orioles for Buster Narum. The Senators completed the deal by sending Lou Piniella to Orioles on August 4.
Read more about this topic: 1964 Washington Senators Season