The Unified Progressive Party (UPP; Korean: 통합진보당, RR: Tonghap Jinbo-dang, Hanja: 統合進步黨) is a banned left-leaning political party in South Korea. It was founded on 5 December 2011 as a merger of the Democratic Labor Party, the People's Participation Party of Rhyu Si-min, and a faction of the New Progressive Party.