George Stephen House, National historic site mansion in Ville-Marie, Montreal, Canada.

George Stephen House is a Victorian mansion at 1430-1440 Drummond Street, designed by William Tutin Thomas and built 1881-1883 as an Italianate palazzo. Its front façade is dominated by the Italian Renaissance style, combined with Italian Baroque and 17th-century English Baroque elements. The interior was conceived as a total work of art, with woodwork by Archibald McIntyre, stained glass by John C. Spence and furniture by Jacques & Hay of Toronto.

George Stephen bought the land on Drummond Street in 1863 under his wife Annie Charlotte Kane's name, and around 1880 commissioned William Tutin Thomas to build a new house there. Construction ran from 1881 to 1883, with foundations on five hundred wooden piles because of the clay soil; the Stephens moved in in June 1883. The house stayed in the family until 1925, when Robert Meighen's succession ended.

From 1927 to 2011 the house was occupied by the Mount Stephen Club, a gentlemen's club that gathered Montreal's and international elite. The club took its name from George Stephen, 1st Baron Mount Stephen, whose family had lived there from 1883. Since 2017 the building has formed part of Le Mount Stephen hotel.

Located on Drummond Street between De Maisonneuve Boulevard and Saint Catherine Street, the building now operates partially as Le Mount Stephen boutique hotel with heritage protection regulations.

The mansion has served as a filming location for Hollywood productions featuring actors like Alec Baldwin and Christopher Plummer, contributing to Montreal's reputation as a major film production hub.