The club was officially founded in 1910 by Henri Mamet, who also became the first president of JL Bourg. In 1956, the team won its first title when it won the
Ain regional championship. The team joined professional competition in 1996 when it entered the
LNB Pro B, the national second division. In 2014, JL Bourg adopted its new home arena, Ekinox, with a capacity of 3,500 spectators. This replaced the Salle des Sports which had a capacity of 2,300. In the same year, the team also promoted to the Pro A after it won the
Pro B Playoffs. They relegated back after the 2014–15 season. In the
2019–20 season, Bourg was in the 5th place until the season was cancelled due to the
COVID-19 pandemic. In the 2020–21 season, Bourg will make its European debut when it will play in the
EuroCup. During the 2023–24 season, Bourg had the first pick of the
2024 NBA draft Zaccharie Risacher on its roster which was on a loaned from
LDLC ASVEL. In the
EuroCup, Bourg had its most successful European season in club history after reaching the finals following a 2–1 semifinal win over
Beşiktaş. But however, they lost to
Paris Basketball in the
2024 EuroCup Finals. ==Honours==