The Great British Beer Festival is an annual beer festival organised by the Campaign for Real Ale (CAMRA). It presents a selection of cask ales, and the Champion Beer of Britain awards, and is held in August of each year. GBBF's sister festival, the Great British Beer Festival Winter, is held in February each year.

A beer festival is an event at which a variety of beers are available for purchase. There may be a theme, for instance beers from a particular area, or a particular brewing style such as winter ales.