See main article: Chorley Borough Council elections.
Elections to Chorley Borough Council were held on 5 May 2011. One third of the council was up for election and the Conservative party lost overall control to NOC.
After the election, the composition of the council was:
| Party | Seats | Council (2011–2012) | ||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | 2010 | 2011 | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Conservative | 27 | 27 | 23 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Labour | 15 | 15 | 20 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Lib Dems | 3 | 3 | 2 | |||||||||||||||||||||||||||||||||||||||||||||||||
| Independent | 2 | 2 | 2 | |||||||||||||||||||||||||||||||||||||||||||||||||
N.B. Percentage change in vote is from 2007