|League of Communist Youth of Yugoslavia|
|Succeeded by||League of Socialist Youth of Yugoslavia|
|Mother party||Communist Party of Yugoslavia|
|International affiliation||World Federation of Democratic Youth|
League of Communist Youth of Yugoslavia (Serbo-Croatian: Savez komunističke omladine Jugoslavije, SKOJ), commonly known in English as the Young Communist League of Yugoslavia, or simply Communist Youth, was the youth wing of the Communist Party of Yugoslavia from 1919 to 1948. Although it was banned just two years after its establishment and at times ruthlessly prosecuted, it continued to work clandestinely and was an influential organization among revolutionary youth in the Kingdom of Yugoslavia, and consequently became a major organizer of Partisan resistance to Axis occupation and local Quisling forces. After World War II, SKOJ became a part of a wider organization of Yugoslav youth, the People's Youth of Yugoslavia, which later became the League of Socialist Youth of Yugoslavia.
SKOJ was founded in Zagreb on October 10, 1919 as a political organization of revolutionary youth the youth which followed the policy of the communist Socialist Workers' Party of Yugoslavia.
Regional committees were originally established but they were abolished in 1920. In 1921, the organization was banned together with the party, which had in the meantime been renamed Communist Party of Yugoslavia. Two congresses were held clandestinely during the 1920s, the Second Congress in June 1923, and the Third Congress in June 1926. SKOJ was affiliated to the Young Communist International. Regional committees were reestablished in 1939.
Seven Secretaries of SKOJ, also known as Seven Courageous, were seven leading figures of the organization, between 1924 and 1931, who died at the hand of the government, in direct confrontation with the gendarmerie, suicide, or indirectly as a consequence of being subjugated to extremely poor conditions during imprisonment and/or torture, which lead to their death from extreme weakening and illness. The Seven were, in sequence of taking the role of a secretary of the organization:
After Axis powers occupied Yugoslavia in 1941, SKOJ organized a united youth front with the program of struggle against fascism and war, Anti-Fascist Youth Committees which at the Congress of Anti-Fascist Youth of Yugoslavia in Bihać in 1942 united into the Unified League of Anti-Fascist Youth of Yugoslavia (Ujedinjeni savez antifašističke omladine Jugoslavije - USAOJ). SKOJ became a part of the umbrella organization, but continued to act autonomously within it.
In May 1946, USAOJ was renamed People's Youth of Yugoslavia (Narodna omladina Jugoslavije - NOJ), and in 1948 SKOJ and NOJ were united into a single organization, which continued to use the name People's Youth of Yugoslavia, and the use of the name SKOJ was discontinued.
NOJ was later renamed League of Socialist Youth of Yugoslavia (Savez Socijalističke Omladine Jugoslavije - SSOJ). This disintegrated together with Yugoslavia in early 1990s.
The Slovenian branch was transformed into the Liberal Democracy of Slovenia, one of the major Slovenian parties.
After the dissolution of Yugoslavia, the New Communist Party of Yugoslavia founded a youth wing with the same name in 1992.