Long Crendon is a village and civil parish in west Buckinghamshire, England, about 3 miles (5 km) west of Haddenham and 2 miles (3 km) north-west of Thame in neighbouring Oxfordshire. The village has been called Long Crendon only since the English Civil War. The "Long" prefix refers to the length of the village at that time, and was added to differentiate it from nearby Grendon Underwood, which used to be known as "Crendon". This name is Old English and means 'Creoda's Hill'.