The Festival Internacional de Benicàssim, commonly abbreviated as FIB, is an annual music festival that takes place in the town of Benicàssim, in the Valencian Community, Spain. It focuses mainly on pop, rock, and electronica artists, as well as short films, fashion shows and art.

The festival begins on the second Tuesday of July, which is when the camping grounds open – although music officially commences Thursday afternoon. FIB is notable for having bands play through the night (5 pm–8 am) and has three main stages, Las Palmas, Visa, and South Beach Dance, with capacities of approximately 30,000, 15,000 and 8,000, respectively. In 2009, the festival capacity exceeded 50,000; in 2020, more than 150,000 visited the festival over the four days the festival lasted.

The first FIB took place in 1995. Since then, Benicàssim has been dedicated to rock, pop, and electronic music as well as featuring artists who are a reference on the world stage.