FC Sion is a Swiss football team from the city of Sion. The club was founded in 1909, and play their home games at the Stade Tourbillon. They have won the Swiss Super League twice, and the Swiss Cup in each of their twelve appearances in the final, the most recent being in 2011.

The first team also known as Olympique des Alpes SA, as Swiss Football League (the top two levels) requires football clubs to be run as a company.

FC Sion were founded in 1909 by Robert Gilliard, who became club captain, and played their first game, a 3-2 win against FC Aigle, the same year. The club grew thanks to contributions from local people, and played their first competitive league fixture in 1914, again a 3-2 victory, this time against FC Monthey. In 1919 Sion formally organised its managerial structure, with Gilliard becoming Vice President, and Charles Aymon taking Presidency.

From 1932 Sion played in the fourth tier of Swiss football, where they spent much of the next twenty years, briefely interrupted by promotion to the third tier in 1944, quickly followed by relegation in 1946. In 1952 Sion returned to the third tier, and five years later gained promotion again to the National League B, followed five years later by promotion to the National League A (now the Swiss Super League) in 1962. 1965 saw the first of FC Sion's Swiss Cup wins, with a 2-1 victory over Servette FC.

Sion may refer to:

Christian Constantin (born 7 January 1957) is a Swiss architect. He is the owner and president of Swiss football club FC Sion. He bought the club, which had previously neared bankruptcy and was relegated from the Swiss Super League, in 2003.

During his ownership of FC Sion, Constantin has employed many head coaches and incurred a transfer ban from FIFA due to the signing of Essam El-Hadary. This transfer ban then led to the club being expelled from the 2011–12 UEFA Europa League as players signed during the transfer embargo were used in competition.

Constantin was formerly a goalkeeper who played for FC Lugano.

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