| Name | Party | Ward | End of Term |
|---|
| Rebecca Knox | Conservative and Unionist | Beaminster | 2021 |
| Pauline Batstone | Conservative and Unionist | Blackmore Vale | 2021 |
| Byron Quayle | Conservative and Unionist | Blandford Forum | 2021 |
| Mark Roberts | Conservative and Unionist | Bridport | 2021 |
| Keith Day | Conservative and Unionist | Bridport | 2021 |
| Kevin Brookes | Conservative and Unionist | Broadwey | 2021 |
| David Jones | Conservative and Unionist | Burton Grange | 2021 |
| Jean Dunseith | Conservative and Unionist | Chickerell and Chesil Bank | 2021 |
| Peter Hall | Conservative and Unionist | Christchurch Central | 2021 |
| Janet Dover | Liberal Democrats | Colehill East and Stapehill | 2021 |
| Shane Bartlett | Liberal Democrats | Colehill West and Wimborne Minster | 2021 |
| Margaret Phipps | Conservative and Unionist | Commons | 2021 |
| Ros Kayes | Liberal Democrats | Corfe Mullen | 2021 |
| Steve Butler | Conservative and Unionist | Cranborne Chase | 2021 |
| Andy Canning | Liberal Democrats | Dorchester | 2021 |
| Richard Biggs | Liberal Democrats | Dorchester | 2021 |
| Andrew Parry | Conservative and Unionist | Ferndown | 2021 |
| Steven Lugg | Conservative and Unionist | Ferndown | 2021 |
| Andrew Cattaway | Conservative and Unionist | Gillingham | 2021 |
| David Walsh | Conservative and Unionist | Gillingham | 2021 |
| Deborah Croney | Conservative and Unionist | Hambledon | 2021 |
| Nick Ireland | Liberal Democrats | Linden Lea | 2021 |
| Tony Ferrari | Conservative and Unionist | Lodmoor | 2021 |
| Bill Pipe | Conservative and Unionist | Lytchett Minster and Upton | 2021 |
| Daryl Turner | Conservative and Unionist | Marshwood Vale | 2021 |
| David Shortell | Conservative and Unionist | Moors | 2021 |
| Ray Bryan | Conservative and Unionist | Moors | 2021 |
| Lesley Dedman | Conservative and Unionist | Mudeford and Highcliffe | 2021 |
| Peter Wharf | Conservative and Unionist | North West Purbeck | 2021 |
| Kate Wheller | Labour Party | Portland Harbour | 2021 |
| Katharine Garcia | Conservative and Unionist | Portland Tophill | 2021 |
| Clare Sutton | Green Party (E&W) | Rodwell | 2021 |
| Derek Beer | Liberal Democrats | Shaftesbury | 2021 |
| Mary Penfold | Conservative and Unionist | Sherborne Rural | 2021 |
| Jon Andrews | Liberal Democrats | Sherborne Town | 2021 |
| Cherry Brooks | Conservative and Unionist | South Purbeck | 2021 |
| Graham Carr-Jones | Conservative and Unionist | Stalbridge and The Beacon | 2021 |
| William Trite | Conservative and Unionist | Swanage | 2021 |
| Jill Haynes | Conservative and Unionist | Three Valleys | 2021 |
| Spencer Flower | Conservative and Unionist | Verwood | 2021 |
| Toni Coombs | Conservative and Unionist | Verwood | 2021 |
| Colin Jamieson | Conservative and Unionist | Walkford | 2021 |
| Beryl Ezzard | Liberal Democrats | Wareham | 2021 |
| David Harris | Liberal Democrats | Westham | 2021 |
| Jon Orrell | Green Party (E&W) | Weymouth Town | 2021 |
| Hilary Cox | Conservative and Unionist | Winterborne | 2021 |