Elections to Buckinghamshire County Council were held on 5 May 2005, alongside the 2005 UK General Election and other local elections in England and Northern Ireland. The entire council was up for election, with each successful candidate serving a four-year term of office, expiring in 2009.
The Conservative Party remained in overall control of the council, winning 44 out of 57 seats. 11 of the remaining seats were won by the Liberal Democrats, whilst the remaining 2 were won by Labour.
The overall turnout was 65.4% with a total of 295,905 valid votes cast. A total of 2,397 ballots were rejected.
Following the last election in 2001 the composition of the council was:
After the election, the composition of the council was:
All results by ward are listed below. The turnout numbers recorded is the valid voter turnout, not the total number of ballots cast including those that were spoiled.