Offseason
- November 28, 2003: Casey Fossum, Brandon Lyon, Jorge de la Rosa, and Michael Goss (minors) were traded by the Red Sox to the Arizona Diamondbacks for Curt Schilling.
- December 16, 2003: Mark Bellhorn was acquired by the Red Sox from the Colorado Rockies as part of a conditional deal.
- December 22, 2003: Gabe Kapler was signed as a free agent by the Red Sox.
Read more about this topic: 2004 Boston Red Sox Season