Elections to Wiltshire County Council were held on 5 May 2005, with the whole council up for election. They proved to be the last to the original county council, as the elections four years later were the first to its successor, the new Wiltshire Council unitary authority. Most electoral divisions had boundary changes, and several were new, including three new two-member divisions, in Salisbury and Trowbridge. The result was that the Conservatives held onto control.