Grey Nuns' Hospital, Former hospital and national historic site in Old Montreal, Canada.

Grey Nuns' Hospital is a three-story stone building on Saint-Pierre Street with tall casement windows and gable roofs. It displays French Canadian features with solid masonry and side additions that expanded space for patient care.

The charitable works of the Charron brothers began in 1691, and the hospital opened in 1694 outside Montreal's fortifications at Pointe-à-Callière. In 1747 Marguerite d'Youville and the Grey Nuns took charge. A fire destroyed the building in 1765, and it was rebuilt on the same spot. The sisters moved to their new motherhouse on Rue Guy in 1871, ending the hospital's role.

The Grey Nuns offered medical care to people of all social backgrounds without distinction. Their work shaped how healthcare became available to everyone in the community.

The building stands south of Place d'Youville, west of Rue Saint-Pierre, in Old Montreal. The half demolished in 1872 made way for an extension of Rue Saint-Pierre and a row of shop-warehouses, so the surviving wing is best seen from the street. It is a National Historic Site; the interior is not open to visitors.

The vaulted cellar, the paupers' room, the old kitchen and its stone sink survive from the French Regime. The site also holds archaeological remains documenting occupation since the 17th century.