Offseason
- November 28, 1984: Dennis Eckersley was signed as a free agent by the Chicago Cubs.
- December 4, 1984: Ron Hassey, Porfi Altamirano, Rich Bordi, and Henry Cotto were traded by the Chicago Cubs to the New York Yankees for Ray Fontenot and Brian Dayett.
- December 7, 1984: Steve Trout was signed as a free agent by the Cubs.
- January 3, 1985: Guy Hoffman was signed as a free agent by the Cubs.
Read more about this topic: 1985 Chicago Cubs Season