The McTavish reservoir (French: Réservoir McTavish), named for Simon McTavish, is an underground reservoir and park located within McGill University's campus on the southern slope of Mount Royal in Montreal, Quebec, Canada. It holds 37 million gallons of water and is supplied by its large Château Style pump-houses located in the south-eastern corner of the park. Atop the reservoir is Rutherford Park. It also is the location of the McTavish automated weather reporting station (CWTA, 71612).