The Hungarian Young Communist League (Hungarian Magyar Kommunista Ifjúsági Szövetség, KISZ) was a communist youth movement in Hungary. It was founded on March 21, 1957 (on the anniversary of the Hungarian Soviet Republic's declaration in 1919), following the break of 1956 Hungarian Revolution. It claimed to represent all the country's youth and sought to educate young people politically and to supervise political as well as some social activities for them. KISZ was the most important source of new members for the party. Its organizational framework paralleled that of the Hungarian Socialist Workers' Party and included a congress, central committee, secretariat, and regional and local committees.
In April 1989 delegates to the organization's national congress voted to change the name of the organization to the Democratic Youth Federation (DEMISZ).