Socialist Youth Front (Danish: Socialistisk UngdomsFront, abbreviated SUF) is a socialist political youth organisation in Denmark, consisting of 1,500 members[1] distributed between 35 autonomous local groups.

Currently, Socialist Youth Front often cooperates with the Red-Green Alliance, and around 80 percent of SUF members are also members of the Red-Green Alliance, though SUF itself retains an extraparliamentary focus.

The politics and doctrine of SUF is, however, based on an anti-parliamentarian, revolutionary, and Marxist world view.

The organization publishes the external magazine Avanti, as well as the internal newsletter Blomster og Barrikader ("Flowers and Barricades").

The highest authority of the Socialist Youth Front is the national congress, which is held twice a year.