EXPRMNTL, also known as the Knokke Experimental Film Festival and Festival du Film Expérimental de Knokke-le-Zoute was the largest Belgian festival dedicated to experimental cinema. The festival succeeded the Brussels Experimental Film Festival (1947 and 1958) and was held under the EXPRMNTL moniker in 1963 (EXPRMNTL 3), 1967 (EXPRMNTL 4) and 1974 (EXPRMNTL 5). It was conceived and curated by Jacques Ledoux and the Cinémathèque royale de Belgique in Knokke-le-Zoute. It was organized five times between 1949 and 1974.
There is no equivalent of its kind today, except perhaps for the programmers at Cinema Nova, and the people at MuHKA cinema and other film museums in Belgium. Another worthwhile film festival is the Brussels International Festival of Fantasy Film.