Belchamp St Paul is a village and civil parish in the Braintree district of Essex, England. The village is 5 miles west of Sudbury, Suffolk, and 23 miles northeast of the county town, Chelmsford. The parish is northwest of Belchamp Otten and Belchamp Walter, in the parliamentary constituency of Braintree, and part of the Stour Valley. It had a population of 331. The parish includes the hamlet of Knowl Green.