Chelmsford Cathedral, formally titled the Cathedral Church of St Mary the Virgin, St Peter and St Cedd, is an Anglican cathedral in the city of Chelmsford, Essex, England, dedicated to St Mary the Virgin, St Peter and St Cedd.

The church of St Mary the Virgin in Chelmsford was probably first built along with the town around 1200. It was rebuilt in the 15th and early 16th centuries and has been modified and extended through to the middle of the 20th century.

It became a cathedral when the Anglican Diocese of Chelmsford was created in 1914.