Elections to Weymouth and Portland Borough Council were held on 5 May 2011, alongside other local elections across the United Kingdom. Twelve seats (one-third) of the council was up for election. The council remained in no overall control.
| Results[1] | ||||
|---|---|---|---|---|
| Party | Seatsbefore | Seatsafter | Change | |
| Conservative Party | 18 | 17 | 1 | |
| Liberal Democrats | 11 | 10 | 1 | |
| Labour Party | 5 | 7 | 2 | |
| Other | 2 | 2 | ||