Union Sportive de la Médina d'Alger (Arabic: الإتحاد الرياضي لمدينة الجزائر); known as USM Alger or simply USMA for short, is a football club based in the inner suburbs of Algiers. The club was founded in 1937 and its colours are red and black. Their home stadium, Omar Hamadi Stadium, has a capacity of 10,000 spectators. The club is currently playing in the Algerian Ligue Professionnelle 1.

The club has one of Algeria's most prominent football records, as it won the Algerian Ligue Professionnelle 1 8 times, the Algerian Cup 8 times and the Algerian Super Cup 2 times. Internationally, USM Alger won the CAF Confederation Cup once in 2023, the CAF Super Cup in 2023 and the UAFA Club Championship once in 2013. The IFFHS ranks USMA in the 18th place of the best African teams of the decade between 2001–2010. USMA reached the final of the 2015 CAF Champions League but they lost to TP Mazembe.

With the past of the Union Sportive Musulmane d'Alger (former name of the USMA), winner of the first 1962–63 Algerian Championnat National, USMA is the postwar reference Algerian War). In one year, the club Algérois won the Algerian championship and subsequently qualified for the finals of the Algerian Cup 1969. The club is going through a difficult period. The club is financially supported, as the USMA was bought in 2010. This privatization is accompanied by positive sporting results: solidly anchored in Ligue 1 since the arrival of the Algerian investor Ali Haddad, they won the Ligue 1 in 2014, and the club regularly qualifies for the current African cups CAF Champions League and CAF Confederation Cup. The USMA also realized 3 titles in 2 years championship-Algerian cup and Super Cup during the season 2013–2014.