The Workers' Party of Korea (WPK) is the sole ruling party of the Democratic People's Republic of Korea, commonly known as North Korea. Founded in 1949 from a merger between the Workers' Party of North Korea and the Workers' Party of South Korea, the WPK is the oldest active party in Korea. It also controls the Korean People's Army, North Korea's armed forces. The WPK is the largest party represented in the Supreme People's Assembly and coexists with two other legal parties that are completely subservient to the WPK and must accept the WPK's "leading role" as a condition of their existence. The WPK is banned in the Republic of Korea under the National Security Act and is sanctioned by the United Nations, the European Union, Australia, and the United States.

Juche, officially the Juche idea, is the state ideology of North Korea and the official ideology of the Workers' Party of Korea. North Korean sources attribute its conceptualization to Kim Il Sung, the country's founder and first leader. Juche was originally regarded as a variant of Marxism–Leninism until Kim Jong Il, Kim Il Sung's son and successor, declared it a distinct ideology in the 1970s. Kim Jong Il further developed Juche in the 1980s and 1990s by making ideological breaks from Marxism–Leninism and increasing the importance of his father's ideas.