Offseason
- October 23, 1978: Will McEnaney was released by the Pirates.
- December 4, 1978: Ken Macha was drafted from the Pirates by the Montreal Expos in the 1978 rule 5 draft.
- December 5, 1978: Odell Jones, Rafael Vásquez, and Mario Mendoza were traded by the Pirates to the Seattle Mariners for Enrique Romo, Rick Jones and Tom McMillan.
Read more about this topic: 1979 Pittsburgh Pirates Season