Offseason
- October 23, 1981: The Mariners traded a player to be named later to the Kansas City Royals for Manny Castillo. The Mariners completed the deal by sending Bud Black to the Royals on March 2, 1982.
- December 9, 1981: Dan Meyer was traded by the Mariners to the Oakland Athletics for Rich Bordi.
- December 11, 1981: Tom Paciorek was traded by the Mariners to the Chicago White Sox for Todd Cruz, Rod Allen and Jim Essian.
- March 5, 1982: Gaylord Perry was signed as a free agent by the Mariners.
Read more about this topic: 1982 Seattle Mariners Season