The Cathedral of the Holy Trinity is the cathedral of the Anglican Diocese of Quebec. It is home to two parishes: the Parish of Quebec and la Paroisse de Tous les Saints. It stands on the western side of Quebec City's Place d'Armes.

The Anglican Diocese of Quebec was founded by Letters Patent in 1793 and is a part of the Ecclesiastical Province of Canada of the Anglican Church of Canada, in turn a province of the Anglican Communion. In 1842, her jurisdiction was described as "Canada East" or "Lower Canada". The diocese comprises 720,000 square kilometres and took its present shape in 1850 with the carving off of what is now the Diocese of Montreal. It includes a territory of west to east from Magog to the Gaspe and the Magdalen Islands, south to north from the United States border to Kawawachikamach and several communities along the Lower North Shore.