St John the Evangelist's Church is a redundant Anglican church in the cathedral city of Chichester in West Sussex, England. Built in 1812 to the design of James Elmes as a proprietary chapel, the octagonal white-brick "evangelical preaching house" reflects the early 19th-century ideals of the Church of England's evangelical wing before High church movements such as the Cambridge Camden Society changed ideas on church design. The Diocese of Chichester declared it redundant in 1973. Although worship no longer takes place in the building, its theatre-like design has made it a popular venue for concerts and musical events. The church is a Grade I Listed building.

A proprietary chapel is a chapel that originally belonged to a private person, but with the intention that it would be open to the public, rather than restricted to members of a family or household, or members of an institution. Generally, however, some of the seating—sometimes a substantial proportion—would be reserved for subscribers.