Original Adidas training shirt AS Saint-Etienne 2007/08

Association Sportive de Saint-Étienne Loire or simply Saint-Étienne, is a professional football club based in Saint-Étienne in Auvergne-Rhône-Alpes, France. The club was founded in 1919 and will compete in Ligue 2, the second division of French football, in the 2022–23 season. Saint-Étienne plays its home matches at the Stade Geoffroy-Guichard.

Saint-Étienne have won a joint-record of ten Ligue 1 titles, as well as six Coupe de France titles, a Coupe de la Ligue title and five Trophée des Champions. Saint-Étienne has also won the Ligue 2 championship on three occasions. The club achieved most of its honours in the 1960s and 1970s when the club was led by managers Jean Snella, Albert Batteux, and Robert Herbin.

Saint-Étienne is known as Les Verts meaning "the Greens" due to its home colours. The club's primary rivals are Olympique Lyonnais, based in nearby Lyon, with whom they contest the Derby Rhône-Alpes. In 2009, the club added a female section.