Socialist Union of Popular Forces

The Socialist Union of Popular Forces (Arabic: الاتحاد الاشتراكي للقوات الشعبية, French: Union Socialiste des Forces Populaires) is a left-of-centre political party in Morocco. It was originally formed as a breakaway from the UNFP, a Socialist opposition party which had itself split from the Istiqlal Party in 1959.

In the parliamentary election held on 27 September 2002, the party won 50 out of 325 seats, making it the largest party in the Moroccan parliament. It governs in coalition with "Istiqlal".

In the next parliamentary election, held on 7 September 2007, the USFP won 38 out of 325 losing 12 seats seats and became only the fifth largest party in parliament. The USFP was included in the government of Prime Minister Abbas El Fassi, formed on October 15, 2007.

The USFP is a full member of the Socialist International.