The 2003 Women's County One-Day Championship was the 7th cricket Women's County Championship season.
It took place in July and saw 21 county teams compete in a series of divisions.
Sussex Women won the County Championship as winners of the top division, achieving their first Championship title.
Teams played matches within a series of divisions with the winners of the top division being crowned County Champions.
Matches were played using a one day format with 50 overs per side.