Union Sportive Madinat Blida (Arabic: الإتحاد الرياضي لمدينة البليدة), known as USM Blida or simply USMB, is a football club based in Blida, Algeria. They play in the Inter-Régions Division, the third tier of Algerian football. Founded in 1932, they have played their home games at Brakni Brothers Stadium since 1936. The club has spent all of its history playing between the first or second tiers.
The club's highest-ever league finish was second in the top flight in 2002–03. They were Algerian Cup runners-up in 1996. The club have also won the second tier title four times.
The club's home colours are green and white, and their nickname is The Salvador.
On 16 June 1932 the club was officially founded with the name Union Sportive Musulmane Blidéenne, and began competing in the Third Division League Football Association of Algiers. They played their first official match on 24 September 1933 in the first round of the North African Cup.
On 5 August 2020, USM Blida were promoted to the Algerian Ligue 2.