Basilica of St Patrick is a Roman Catholic church located on Adelaide Street in Fremantle, Western Australia.

[3] Designed by Michael Cavanagh in a gothic revival style, the foundation stone was laid on St Patrick's Day, 17 March 1898 and the nave opened on 3 June 1900.

The design incorporated a nave with aisles and clerestory, transepts, a wide and spacious apse, with a tower and spire supported by flying buttresses rising from the northern side.

The organs were given as a thanksgiving in memory of the many priests of the Congregation of Oblates of Mary Immaculate who have served the parish since their arrival from Ireland in 1894.

The work carried out was extensive, involving the complete reorganisation and expansion of the internal layout, with several new divisions, additional pipework and complete revoicing, new winding system, new serial drive MIDI electrical and combination systems, made by Muldersoft of Auckland, and a new low profile transept console.