A castell (Catalan pronunciation: [kəsˈteʎ]: literally, castle) is a human tower built traditionally at festivals in a part of Catalonia (Spain), now also found in the rest of Catalonia, in the Balearic islands and in the Valencian Community.

At these festivals, several colles castelleres (teams that build towers) attempt to build and then dismantle a tower's structure. On 16 November 2010, castells were declared by UNESCO to be amongst the Masterpieces of the Oral and Intangible Heritage of Humanity.