St Mary's Watford is a Church of England church in Watford, Hertfordshire, in the United Kingdom. It is situated in the town centre on Watford High Street, approximately 25 kilometres (16 mi) outside London. St Mary's is the parish church of Watford and is part of the Anglican Diocese of St Albans. Thought to be at least 800 years old, the church contains burials of a number of local nobility and some noteworthy monumental sculpture of the Elizabethan and Jacobean eras.