1000 de la Gauchetière is a skyscraper in Montreal, Quebec, Canada. It is named for its address at 1000 De la Gauchetière Street West in the downtown core. It is Montreal's tallest building as per the height definition of the National Building Code of Canada that is used by the city of Montreal, which excludes spires. For international comparison, spires are included as per the Council on Tall Buildings and Urban Habitat's most widely used height definition for building height and the building is thus the second tallest building as per this definition. It rises to the maximum elevation approved by the city at 232.5m above mean sea level with a total height from the average ground level around first floor to roof of 205m (673ft) and 51 floors. A popular feature of the building is its atrium, which holds a large ice skating rink. The building was not subject to the 1992 municipal maximum height of 200m because it was finished in 1992.

Downtown Montreal is the central business district of Montreal, Quebec, Canada.