The 2003–2004 session was a session of the California State Legislature.

The party affiliation and district numbers of Senators are listed after their names in this list.

President Pro Tem: John L. Burton (D-3) Majority Leader: Don Perata (D-9) Minority Leader: Jim Brulte (R-31) to May 10, 2004; Dick Ackerman (R-33) from May 10, 2004

Analysis of Bills The party affiliation and district numbers of Assembly members are listed after their names in this list.