| Administrator(s) | England and Wales Cricket Board |
|---|---|
| Cricket format | 50 over |
| Tournament format(s) | League system |
| Champions | Sussex (1st title) |
| Participants | 21 |
| Most runs | Taryn Keir (303) |
| Most wickets | Lynne Spooner (12) |
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.