Buckinghamshire Constabulary was the Home Office police force for the county of Buckinghamshire, England, until 1968.
Buckinghamshire Constabulary was established in 1857. It later absorbed Buckingham Borough Police (established in 1836) and Chepping Wycombe Borough Police (established in 1849). In 1965, it had an establishment of 738 and an actual strength of 672.
On 1 April 1968, Thames Valley Constabulary was formed by the amalgamation of Buckinghamshire Constabulary, Berkshire Constabulary, Oxford City Police, Oxfordshire Constabulary and Reading Borough Police.