2017 Dorset County Council election

The 2017 Dorset County Council election took place on 4 May 2017 as part of the 2017 local elections in the United Kingdom. All 46 councillors were elected from 40 electoral divisions, which returned either one or two county councillors each by first-past-the-post voting for a four-year term of office.

Boundary changes to the electoral divisions, saw an increase in councillors from 45 to 46 and decrease in electoral wards from 42 to 40, took effect at this election after a review of the county by the Local Government Boundary Commission for England.

Bridport
A by-election was held for the Bridport ward of Dorset County Council on 22 February 2018 following the resignation of Liberal Democrat councillor Ros Kayes.

Ferndown
A by-election was held for the Ferndown ward of Dorset County Council on 25 October 2018 following the death of Conservative councillor Steve Lugg.