The Mistral One Design Class (MOD) is a one-design windsurfing class chosen by the International Sailing Federation (ISAF) for use at the Olympic regatta in Atlanta 1996, Sydney 2000 and Athens 2004. Starting with the 2008 Summer Olympics it was replaced by the RS:X class, which will be replaced by the iQFoil class for the 2024 Summer Olympics.

Windsurfing is a wind propelled water sport that is a combination of sailing and surfing. It is also referred to as "sailboarding" and "boardsailing", and emerged in the late 1960s from the Californian aerospace and surf culture. Windsurfing gained a popular following across Europe and North America by the late 1970s and had achieved significant global popularity by the 1980s. Windsurfing became an Olympic sport in 1984.