The Rio Tinto Alcan Planetarium is the successor to the Dow Planetarium (known in later years as the Montreal Planetarium), and is located in the Space for Life, near the Olympic Stadium and the Biodome in Montreal, Quebec, Canada. The new installation has two separate theatres as well as exhibits on space and astronomy. It was officially opened in April 2013.

The building, designed by Cardin + Ramirez et Associés, Architectes, is certified as LEED Platinum.

The Rio Tinto Alcan Planetarium is the successor to the Montreal Planetarium, formerly known as the Dow Planetarium, which operated from April 1, 1966, to October 10, 2011.

The new planetarium is part of the Space for Life museum complex, a cluster of museums focusing on nature. Sustainable development is a focus for the Space for Life, as reflected in the planetarium's architecture and its status as a LEED Platinum certified building. Constructed of aluminum and concrete, the building contains an exhibition area and two dome theatres named "Chaos" and "Milky Way". Artistic direction was by Michel Lemieux and Victor Pilon.

Visitors choose one of two programs, then view two presentations, one in each theatre. One presentation focuses on the science of astronomy while the other presents a more artistic view of space. There is also an exhibition area with exhibits on meteorites and an area, Exo, which uses touchscreen panels to discuss the origin of life and the possibility of life on other worlds (exobiology). All exhibits and presentations are in French and English.

A 40-minute presentation about the aurora borealis, Aurōrae, combines images of the Northern Lights with music and live commentary by the planetarium's science interpreters. The origin of the phenomenon is described. A team from the planetarium gathered over 179,000 images in March 2015 in Yellowknife. At that location, light pollution is low and the aurora is visible, on average, 240 nights per year.

Other films shown at the planetarium, some presented with live commentary, include the American Museum of Natural History's Dark Universe and National Geographic's Asteroid: Extreme Mission.

• Nicolaus Copernicus Monument, Montreal

• Rio Tinto Alcan Planetarium - official site