📸 Olympique de Marseille, France football club: Photo Gallery (Photo: 12)

Olympique de Marseille (French: [ɔlɛ̃pik də maʁsɛj], locally [olɛ̃ˈpikə də maχˈsɛjə]; Occitan: Olimpic de Marselha, pronounced [ulimˈpi de maʀˈsejɔ]), also known simply as Marseille, or by the abbreviation OM (IPA: [o.ɛm], locally [oˈɛmə]), is a French professional football club based in Marseille which competes in Ligue 1, the top flight of French football. Marseille play their home matches at the Stade Vélodrome. The club is one of the most popular football clubs in the country, having regularly averaged the highest attendance in French football. They have a long-standing rivalry with Paris Saint-Germain, against whom they contest Le Classique.

Founded in 1899, their name was inspired by the ancient Olympic Games and they are nicknamed Les Phocéens (The Phocaeans). Marseille established itself in the top flight during the 1920s, and won their first league title in 1937. The club's pinnacle came in the 1990s under the ownership of French businessman Bernard Tapie, as they won six trophies, including four consecutive league titles and their first European honour, the UEFA Champions League in 1993. The club struggled during the 2000s, but had a slight resurgence in the 2010s, under the management of former club captain Didier Deschamps, winning six titles, including their first Ligue 1 title in 18 years in 2010.

Behind PSG, Marseille is the second most decorated French football team with a total of 29 trophies, including 28 major titles. They have won 26 domestic trophies: nine league titles, one Ligue 2 title, ten Coupe de France, one Coupe Charles Drago, three Coupe de la Ligue, and three Trophée des Champions. Internationally, they won the UEFA Champions League in 1993, becoming the first French side to claim the trophy and one of just two French teams to secure a major European title. The UEFA Intertoto Cup in 2005 marked the club's second continental triumph. They were also runners-up at the European Cup (currently the Champions League) in 1991 and at the UEFA Europa League (formerly the UEFA Cup) in 1999, 2004 and 2018.

American businessman Frank McCourt bought 95% of the club's stake in 2016 and Marseille was listed in the Deloitte Football Money League at the end of the 2023–2024 season, making it the football club with the 19th highest revenue in the world, approximated at €287 million.

In 2025, Marseille was 26th in the global ranking by British consultancy organisation Brand Finance in terms of brand value, and 21st in terms of brand strength with a rating AA (\"very strong\").