Arlesey is a town and civil parish in the Central Bedfordshire district of Bedfordshire, England. It is near the border with Hertfordshire, about three miles north-west of Letchworth Garden City, four miles north of Hitchin and six miles south of Biggleswade. Arlesey railway station provides services to London, Stevenage and Peterborough. The Domesday Book of 1086 mentions Arlesey. The town's name means the 'island of a man named Aelfric'.

Central Bedfordshire is a unitary authority area in the ceremonial county of Bedfordshire, England. It was created in 2009.