Offseason
- December 2, 1963: Byron Browne was drafted from the Pirates by the Chicago Cubs in the 1963 first-year draft.
- January 14, 1964: Dock Ellis was signed as an amateur free agent by the Pirates.
- Prior to 1964 season: John Lamb was signed as an amateur free agent by the Pirates.
Read more about this topic: 1964 Pittsburgh Pirates Season