The club was founded in the early 20th century as
RFC Bressoux, registered with the Belgian FA under matricule 23, but renamed in 1992 to
Royale Union Liégeoise or
RUL after a merger. Upon the default of
R.F.C. Seraing in 1996, the club was renamed to
Seraing RUL and started playing at the
Stade du Pairay where the former RFC Seraing played until its default. It was however an entirely different club and completely distinct from the former RFC Seraing. Seraing RUL was at that time playing at the fourth level of Belgian football. The club would remain at the lower levels of Belgian football, never higher than the third level. It 2006, the club changed its name to
RFC Seresien in reference to the club whose place it took, and two years later was again renamed to
RFC Seraing after a merger. In 2014, RFC Seraing, playing in the fifth tier, was acquired by the owner of
FC Metz and entered an agreement to swap matricules with the second-tier club
Boussu Dour Borinage in order for Seraing to move up to a higher level. As a result, the club started the 2014–15 season in the Belgian Second Division with matricule 167 and under the new name
Seraing United, but reverted to
RFC Seraing one season later. With the Belgian league reform of 2016, the club dropped back to the third level, but managed to achieve promotion twice in succession in 2019–20 and 2020–21 to reach the
2021–22 Belgian First Division A, bringing back top division football to the city of
Seraing after 25 years. In 2022–23 season, Seraing got relegated back to Challenger Pro League. In the following season, the club avoided relegation to
Belgian National Division 1 for the 2024–25 season after finishing 15th place in
2023–24 Challenger Pro League due to the administrative relegation of
K.V. Oostende. They also avoided relegation next season ahead of
Jong Genk after a rule that would’ve prevented their relegation was passed after Jong Genk’s relegation, and after the bankruptcy of
K.M.S.K. Deinze. == Honours ==