Offseason
- December 21, 2004: Craig Counsell was signed as a Free Agent with the Arizona Diamondbacks.
- January 11, 2005: Shawn Green was traded by the Los Angeles Dodgers to the Arizona Diamondbacks for Dioner Navarro, Beltrán Pérez, Danny Muegge (minors), and William Juarez (minors).
- January 11, 2005: Randy Johnson was traded by the Arizona Diamondbacks to the New York Yankees for Javier Vázquez, Brad Halsey, Dioner Navarro, and cash.
Read more about this topic: 2005 Arizona Diamondbacks Season