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 | ± | |
|---|---|---|---|
| Labour | 22 | ||
| Conservative | 18 | 2 | |
| Liberal Democrat | 4 | 2 | |
| Independent | 3 | ||