The Cathedral Church of St Mary and St Thomas is a Roman Catholic cathedral in Northampton, England. It is the seat of the Bishop of Northampton and mother church of the Diocese of Northampton which covers the counties of Northamptonshire, Bedfordshire, Buckinghamshire and part of Berkshire (formerly in Buckinghamshire) north of the River Thames. The cathedral is situated in the north of the town, along the Barrack Road.