The Muixeranga ( ) is the collective name given to the performance of ancient street dances and human pyramids or castells, originating in the ancient Kingdom of Valencia, which are still preserved in the town of Algemesí, 30 km (19 mi) southwest from Valencia, and certain other Valencian towns.

A human pyramid is an acrobatic formation of three or more people in which two or more people support a tier of higher people, who in turn may support other, higher tiers of people. People above the bottom tier may kneel or stand on the shoulders, backs or thighs of the people below them. Typically, the number of people in each tier is one greater than the tier immediately above it, resulting in a triangular structure reminiscent of the formation's namesake.