Foundation and early years K.A.S. Eupen were formed on 9 July 1945 from the merger of Jugend Eupen and FC Eupen 1920, and played its first official match on 21 July during a festive tournament during a national holiday. A few weeks later, the club would begin on its inaugural season in the Liège Provincial Division II. Despite this, Eupen had an average season, finishing only in thirteenth place. The 1973–74 season also marked the return of Hubert Van Dormael, as coach, with Prokop regaining his status as a player. This proved a positive change, as the team occupied the top of the league standings in the fall. Slightly running out of steam, Eupen remained on course for promotion before the last matchday of the season against
Lokeren. While Eupen were up 0–1 fifteen minutes before full-time, Lokeren scored on a penalty kick to equalise, before scoring a second goal at the very end of the match. This meant that Lokeren went past Eupen in the standings, and meant that they missed out on direct promotion. The club remained in the third division until the end of the 1987–88 season. For a few seasons, Eupen played in the
Belgian Fourth Division. It even took the providential return of club legend, Hubert Van Dormael, to save the club from relegation in the spring of 1989. From 1992, performances improved. In 1995, under the leadership of
Tony Fagot, Eupen finished second in the league and once again reached the third division, this time through promotion play-offs. During this period, primarily young players from the region represent the first team, including Marc Chauveheid, son of the coach and scorer of 90 goals during his career at Eupen. Thanks in particular to this father-son connection, the club won another title and returned to the second division for the first time since 1977. Surprisingly, the club pushed on for promotion to the First Division, which they were close to reaching in the 2002–03 season, before eventually losing in the play-offs. the club fell to the bottom of the second division in the winter of 2008. At that point, Italian investors, represented by
Antonino Imborgia, took over at the Kehrweg. Many players from Italy and Switzerland, in particular, were signed to the club. During construction, Eupen played their first home matches at
Stayen in
Sint-Truiden. Their start to life in the top tier was difficult, and the team suffered five defeats in five matches. Danny Ost was dismissed and replaced by
Ezio Capuano. He only stayed in charge of the team for 19 days before resigning and being replaced by
Albert Cartier. Under the French manager the team gradually improved. For their first home match at the rebuilt stadium, Eupen won their first match at top level in a 6–0 blowout over
Sint-Truiden. The club quickly recorded other positive results, but would struggle against relegation for large parts of the
2010–11 season. In the final matchday of the regular season, Eupen played away against another relegation candidate,
Mechelen, while
Lierse, themselves also fighting relegation, played away at
Club Brugge. While Eupen lost their match 2–0, Lierse managed a 0–0 draw to heed themselves from relegation. Eupen then had to go through relegation play-offs where they managed to qualify for the
final rounds, while direct competitor
Charleroi were relegated. Eupen would, however struggle in the final round against teams from the second division, where Eupen finished dead last which meant relegation and a return to the second division.
Qatari ownership In June 2012, the club was purchased by the government of
Qatar and its
Aspire Zone Foundation, who also own
Paris Saint-Germain.
Aspire Academy announced their intent to use the club as a launching pad into European football for its academy graduates from Africa, South America and Asia. Eupen finished second in the 2015–16 Second Division, gaining promotion to the top flight of Belgian football for the second time in their history, staying up at the end of the season for the first time. On 9th December 2025,
Qatar Sports Investments announced their intention to buy the club from Aspire. ==Honours==