St Martin's House is a heritage-listed former private hospital and now administration building within the grounds of St John's Cathedral at 373 Ann Street, Brisbane City, City of Brisbane, Queensland, Australia. It was designed by Lange Leopold Powell and built c. 1922 by Thomas Keenan. It is also known as St Martin's Hospital. It was added to the Queensland Heritage Register on 21 October 1992.

St John's Cathedral is the cathedral of the Anglican Diocese of Brisbane and the metropolitan cathedral of the ecclesiastical province of Queensland, Australia. It is dedicated to St John the Evangelist. The cathedral is situated in Ann Street in the Brisbane central business district, and is the successor to an earlier pro-cathedral, which occupied part of the contemporary Queens Gardens on William Street, from 1854 to 1904. The cathedral is the second-oldest Anglican church in Brisbane, predated only by the extant All Saints church on Wickham Terrace (1862). The cathedral is listed on the Queensland Heritage Register.