St Mary's Church, Haddington Road, Dublin, Catholic church on Haddington Road in Dublin, Ireland

St Mary's Church is a Catholic church on Haddington Road in Dublin, built in the Gothic Revival style by an unknown original architect. Ground was broken in 1835 and the church was blessed in 1839 by Archbishop Daniel Murray, then still without a ceiling or internal plastering. A chancel with apse by Charles Geoghegan was added in 1877-78, and the frontage of 1898 is by John Joseph O'Callaghan.

Ground was broken in 1835 and Archbishop Daniel Murray blessed the church in 1839, when it had an earthen floor, no ceiling and no internal plastering. Plastering followed in 1842, a passage on the east side in 1844 and wooden flooring in 1848. Charles Geoghegan designed a new chancel with apse in 1877–78, opened on 9 November 1879.

The church stands on Haddington Road in Dublin, not Howth, and its name recalls the Catholic emancipation era that helped prompt its construction. The Lee Memorial Tower, added after 1898, is named for the parish priest the Very Reverend James Canon Lee.

St Mary's Church stands on Haddington Road on Dublin's south side, near the Grand Canal and Beggars Bush Barracks. The entrance frontage and Lee Memorial Tower face the road, so the 1898 facade and the tower by Walter Doolin are the first elements seen on arrival.

The bell tower added after 1898 is called the Lee Memorial Tower, named for the parish priest the Very Reverend James Canon Lee. The 1898 frontage was designed by John Joseph O'Callaghan and built by James Kiernan.