See main article: Chorley Borough Council elections.
Elections to Chorley Borough Council were held on 1 May 2003. One third of the council was up for election and the council stayed under no overall control.
After the election, the composition of the council was:
| Party | Seats | ± | ||
|---|---|---|---|---|
| 22 | ||||
| 18 | 2 | |||
| 4 | 2 | |||
| 3 | ||||