Jagiellonia Białystok (Polish pronunciation: [jaɡʲɛˈlɔɲa bʲaˈwɨstɔk]) is a Polishfootball club, based in Białystok, that plays in Ekstraklasa. It has also played in the Ekstraklasa, the top level of Polish football, between 1987 and 1990 and 1992–93 season. It finally returned to the top level in 2007. It also played in Liga I, the second level of Polish football, during the periods of 1975–78, 1980–81, 1983–87, 1990–92, 1993–96, 2001–02 and 2003–07.
Founded in 1920, Jagiellonia plays home games at Białystok City Stadium. The club won the Polish Cup in 2010, Super Cup and qualified to play in the third round qualification of the UEFA Europa League. It was the club's first appearance in the European cup, making it the team's most successful season before finishing Ekstraklasa as 4th in 2010–11 season. The new 22,386 seat stadium is expected to be completed by the end of 2014.