See main article: Chorley Borough Council elections.
Elections to Chorley Borough Council were held on 6 May 1999. One third of the council was up for election and the Labour party kept overall control of the council.
After the election, the composition of the council was:
| Party | Seats | ± | ||
|---|---|---|---|---|
| 31 | 3 | |||
| 9 | 3 | |||
| 6 | ||||
| 2 | 1 | |||