The Buckinghamshire County Museum is a museum in the centre of Aylesbury, in Buckinghamshire, England. It displays artefacts pertinent to the history of Buckinghamshire including geological displays, costume, agriculture and industry. The museum also features changing art exhibits in the Buckinghamshire Art Gallery.
The museum is housed in three old buildings that have been joined together: a chapel in St Mary's Square, the old Aylesbury Grammar School and Ceely House.
To the rear of the building, in what used to be Ceely House's coach house, is the Roald Dahl Children's Gallery.
The current director of the museum is Sue Shave.
