St John's Downshire Hill, Hampstead, is a proprietary chapel of the Church of England, located in Downshire Hill, Hampstead, London, in the Parish of St Stephen with All Hallows. Referred to as St John's Church, the building is formally a chapel. The church should not be confused with St John-at-Hampstead, which is located in Church Row, Hampstead, being the parish church of what is now the neighbouring parish.