F91 Dudelange (; , ) is a Luxembourger professional football club based in Dudelange which plays in the Luxembourg National Division. It was formed in 1991 as a merger between three teams in the town: Alliance Dudelange, Stade Dudelange and US Dudelange. Domestically, it has since won the National Division on 15 occasions and the Luxembourg Cup eight times. F91 Dudelange qualified for the 2018–19 UEFA Europa League, becoming the first club from the country to reach the group stage of a European competition. Dudelange also made the 2019–20 UEFA Europa League group stage where they became the first team from Luxembourg to win a game in the group stage after a shock 4–3 victory over APOEL of Cyprus. History It was formed in 1991 from the clubs Alliance Dudelange, Stade Dudelange, and US Dudelange. All three clubs had won the National Division or the Luxembourg Cup before, but each had fallen upon hard times, and the amalgamated club was expected to be more stable, in both a sporting and financial sense. Turning the club into a title-challenging team took a while. Stade Dudelange and US Dudelange had been in Luxembourg's third tier (the 1. Division), whilst Alliance Dudelange was struggling to remain in the second league (the Division of Honour). The new club would take Alliance's place in the Division of Honour in the 1991–92 season. F91 was promoted in its first season, and soon established itself as a competent top-flight team, not finishing outside the top half of the table until 1996–97. Towards the end of the 1990s, Dudelange gradually improved, and brought to an end Jeunesse Esch's era of dominance by storming to the 1999–00 league title by eleven points. In 2004–05, Dudelange won the title and competed in the UEFA Champions League for the 2005–06 season. In the competition Dudelange became the first club in Luxembourg's history to reach the second qualifying round, after a remarkable victory over NK Zrinjski (they lost 0–1 at home in the first leg, in the second leg they scored a goal in the 3rd minute of stoppage time to equalize on aggregate, and then scored 3 more goals in extra time). However, Dudelange were easily beaten by Rapid Wien in the second qualifying round. In the 2005–06 season, Dudelange completed the league and cup Double for the first time since the merger. They replicated this feat in the 2006–07 season,