Socialistisk Folkepartis Ungdom (Youth of the Socialist People's Party) is the youth wing of the Socialist People's Party of Denmark, founded in 1969. In 2008 it became the biggest youth party political organisation in Denmark.
Since 2000, the SFU has made a left turn and grown to be the largest socialist youth organisation in Denmark. In 2008, SFU consisted of over 3000 members, 16 regional departments and more than 100 local branches.
In 2002, the small non-marxist section of the SFU left the organisation, mainly for the mother party or forthe Social Democrats.