Keyston is a village in Cambridgeshire, England. Keyston lies approximately 12 miles (19 km) west of Huntingdon, near Molesworth. Keyston is in the civil parish of Bythorn and Keyston. Keyston is situated within Huntingdonshire which is a non-metropolitan district of Cambridgeshire as well as being a historic county of England. Known as Chetelestan in the Domesday Book, the name Keyston means "Boundary stone of a man called Ketil". By the 13th century it was known as Keston, and Keyston from the 16th century.