The Ottawa International Animation Festival is an annual animated film and media festival that takes place in Ottawa, Ontario, Canada. The OIAF was founded in 1975, with the first festival held from August 10 to 15 in 1976. Initially organized by the Canadian Film Institute on a biennial basis and with the co-operation of the International Animated Film Association, the Festival organization now remains in the hands of the CFI. It moved from a biennial to an annual festival in 2005. Today the festival is recognized as the largest and oldest animation festival in North America, and regularly attracts upwards of 25,000 attendees when it is held each September.

A film festival is an organized, extended presentation of films in one or more cinemas or screening venues, usually in a single city or region. Increasingly, film festivals show some films outdoors. Films may be of recent date and depending upon the festival's focus, can include International and Domestic releases. Some film festivals focus on a specific filmmaker, genre of film, or subject matter. Several film festivals focus solely on presenting short films of a defined maximum length. Film festivals are typically annual events. Some film historians, including Jerry Beck, do not consider film festivals as official releases of the film.