St Patrick's Church, The Rocks, Catholic church in The Rocks, Australia

St Patrick's Church stands at the corner of Grosvenor and Gloucester Streets in The Rocks, built of brown and grey stone in a Gothic style. Its central gabled facade holds three tall pointed-arch windows with dark glass and a quatrefoil opening above, with three pointed-arch doorways below. A square stone tower rises at the far left, and a low stone wall runs along the front boundary.

William Davis, a Catholic emancipist transported after the Irish Rebellion of 1798, donated the land in 1840; he had hosted Catholic prayer at his home when Sydney had no resident priest. The foundation stone was blessed on 25 August 1840, and Andrew Ross & Co. built the church to a design by John Frederick Hilly, replacing an unsuitable plan by William Fernyhough. It was dedicated on 18 March 1844, the day after Saint Patrick's Day, to avoid drunken and sectarian trouble. Davis died in August 1843, before completion.

The church and its 1865 school, run by the Sisters of Mercy, along with nearby Scots Kirk and St Philip's, gave the area the nickname "Church Hill", still used on the sign at the tower's base. The Marist Fathers have administered the parish since 1868, when Irishman John McEncroe, its first permanent priest, asked that it be entrusted to them.

The church stands at the corner of Grosvenor and Gloucester Streets, with the entrance on the gabled facade facing the street and a low stone wall along the front boundary. The tower rises at the far left of the facade. It remains an active parish, so visits are best timed outside Mass; the interior can be seen during services.

The tower's louvered octagonal belfry and pinnacle sit above a square base with a small arched window, and a black bird often perches on a curved metal arm fixed to the stone. The church is also called St Pat's Church Hill, a name shared with the surrounding precinct.