Offseason
- October 2, 1958: Dick Williams was traded by the Orioles to the Kansas City Athletics for Chico Carrasquel.
- Prior to 1959 season (exact date unknown)
- John Anderson was obtained by the Orioles from the Miami Marlins after expiration of minor league working agreement.
- Bob Saverine was signed as an amateur free agent by the Orioles.
Read more about this topic: 1959 Baltimore Orioles Season