The Guaranteed Pure Milk bottle is a landmark water tower in Montreal, Quebec, Canada, located at 1025 Lucien-L'Allier Street. The six-tonne, 10-metre-high Art Deco structure was designed in 1930 by architects Hutchison, Wood & Miller as advertising for the Guaranteed Pure Milk Company.
The giant riveted steel quart of milk was built by Dominion Bridge Company. It has a 250,000 litre capacity.
In 2009, it was restored after years of disrepair, thanks to the efforts of volunteers, $100,000 in private donations, and lobbying by Heritage Montreal.