The Alumnae Theatre, known most often as The Alum, is the oldest theatre society in Toronto, Canada still in operation. It was founded in 1919 by female graduates of the University of Toronto who wanted to continue to participate in semi-professional theatre after graduation. Originally all performers in all roles were female, but in the 1920s male guest performers began to be invited to join the performances. Still today the leadership of the society remains entirely female.
Its focus has always been to produce the great plays of the western canon, while also sometimes doing more modern works, such as the Toronto premier of one of Carol Shields works. The society original performed at the university's Hart House Theatre. In the 1957 the society renovated an old coach house, and opened the Coach House Theatre. In 1962 the theatre moved again into a former synagogue on Cecil and Huron streets. In 1970 they were evicted from this location when the site was expropriated by Ontario Hydro. After a brief hiatus, the company found a permanent home in an old fire hall at Adelaide and Berkeley streets in 1972. Originally named Firehall No. 4, the building is one of Toronto's historic Toronto fire stations. It was first built in 1900 and was considerably renovated by architect Ron Thom, whose wife Molly was a long time member of Alumnae Theatre. The firehall had been slated by city council for demolition, until the theatre company intervened and with the help of John Sewell convinced the city to have it saved and restored for their purposes. The building now contains a main performance space on the ground level, which seats 140. Upstairs is a smaller studio venue on the third floor.