Chelmsford Cathedral in the city of Chelmsford, Essex, England, is dedicated to St Mary the Virgin, St Peter and St Cedd. It became a cathedral when the Anglican Diocese of Chelmsford was created in 1914 and is the seat of the Bishop of Chelmsford.

Cedd was an Anglo-Saxon monk and bishop from the Kingdom of Northumbria. He was an evangelist of the Middle Angles and East Saxons in England and a significant participant in the Synod of Whitby, a meeting which resolved important differences within the Church in England. He is venerated in the Catholic Church, Anglicanism, and the Orthodox Church.