Odsey is a hamlet in the civil parish of Steeple Morden, Cambridgeshire, England, close to the border with Hertfordshire. It lies just off the A505 road roughly equidistant between Royston and Baldock. It is the location of Ashwell and Morden railway station, which serves the nearby villages of Ashwell, Steeple Morden and Guilden Morden, and offers direct train links to Cambridge and London Kings Cross.