St John's Church, Manchester, also known as St John's, Deansgate, was an Anglican parish church in Manchester, England, established in 1769 and demolished in 1931. Its site is now that of St John's Gardens, situated between Lower Byrom Street, and Quay Street. Today the graveyard of the church is commemorated by a stone cross and a plaque states that more than 22,000 bodies lie buried in the vicinity. Among those buried in the churchyard are John Owens, the founder of Owens College, and William Marsden, who founded the concept of a half-day holiday on Saturdays.