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.

Chichester is a cathedral city and civil parish in West Sussex, England. It is the only city in West Sussex and is its county town. It was a Roman and Anglo-Saxon settlement and a major market town from those times through Norman and medieval times to the present day. It is the seat of the Church of England Diocese of Chichester, with a 12th-century cathedral.