Royal Canadian Military Institute, Military museum at University Avenue, Toronto, Canada

The Royal Canadian Military Institute is a private members' organization at 426 University Avenue in Toronto, with a museum, archive, library and art collection focused on Canadian military arms, equipment and uniforms. Its building was reconstructed and reopened in June 2014 after a four-year project; the 1907 facade was rebuilt in 2007 using archaeological records.

On January 14, 1890, 50 officers of the Toronto Garrison founded the Canadian Military Institute, with Lord Stanley as patron; the Militia Institute donated 200 military volumes. Membership was restricted to army officers until 1940, when it opened to navy and air officers and briefly became the Canadian Officers' Club and Institute. The University Avenue building dates from 1907–08, with additions in 1912 and 1935.

The institute hosts lectures, exhibitions, and educational programs throughout the year that draw military professionals and enthusiasts interested in Canada's strategic thinking. These events reflect how the public engages with military history and global security topics in contemporary times.

The museum offers guided tours for visitors interested in military history and has specialized spaces for research work. It is easily accessible by public transit, with convenient proximity to St. Patrick Station.

The institute's museum holds a collection on the evolution of Canadian military arms, equipment and uniforms. Its library began with 200 military volumes presented by the Militia Institute when the RCMI was founded in 1890.