The club was founded as
Stade Gaillacois and was only the third rugby union club in Tarn. In 1905, it became
Stade Athlétique Gaillacois and in 1910
Union Sportive Gaillacoise. In 1940, the French rugby federation cancelled the championship and the club was forced out of business, but a new club was founded,
Union Athlétique Gaillacoise, with rugby, football, boxing, tennis, athletics, swimming and volleyball sections. In 1948, the club associated with the local train workers and became
Union Athlétique des Cheminots (Railwaymen) de Gaillac. In 1950, the club reverted to its former name. Gaillac was always in the lower divisions of the southwest rugby leagues until it managed to reach the lowest level of the national championship in 1968. It was relegated a few years after and had to wait until 2001 to join the highest level of amateur rugby called Fédérale 1. In 2006, finally, Gaillac reached the second professional division,
Rugby Pro D2, after winning the
Fédérale 1 title. Gaillac finished in 10th place in their first season in Pro D2, but ran into serious financial difficulties, and proposed a merger with the nearby Graulhet club. The merger fell through, and after the end of the
2006-07 season, the French sporting authorities forcibly relegated Gaillac to
Fédérale 1. The club was then placed into bankruptcy in July 2007, leading to a further drop to Fédérale 3. ==Honours==