The 2015 Catalan regional election was held on Sunday, 27 September 2015, electing the 11th Parliament of the autonomous community of Catalonia. All 135 seats in the Parliament were up for election. This was the third regional Catalan election in only five years, after the 2010 and 2012 elections and the first one in over 37 years in which Democratic Convergence of Catalonia (CDC) and Democratic Union of Catalonia (UDC) ran separately, after the dissolution of Convergence and Union (CiU) in June 2015 over disagreements on the coalition's separatist turn.

The Parliament of Catalonia is the unicameral legislature of the autonomous community of Catalonia. The Parliament is currently made up of 135 members, known as deputies, who are elected for four-year terms or after extraordinary dissolution, chosen by universal suffrage in lists of four constituencies, corresponding to the Catalan provinces. The Parliament building is located in Ciutadella Park, Barcelona.