Offseason
- December 2, 2003: Chris Carpenter was signed as a Free Agent with the St. Louis Cardinals.
- December 13, 2003: J. D. Drew was traded by the St. Louis Cardinals with Eli Marrero to the Atlanta Braves for Jason Marquis, Ray King, and Adam Wainwright.
- January 10, 2004: Alan Benes was signed as a Free Agent with the St. Louis Cardinals.
Read more about this topic: 2004 St. Louis Cardinals Season