Liechtenstein Cup 2009–10 was the sixty-fifth season of Liechtenstein's annual cup competition. Seven clubs competed with a total of eighteen teams for one spot in the second qualifying round of the UEFA Europa League. Defending champions were FC Vaduz, who have won the cup continuously since 1998, and defended their title.
The First Round featured twelve teams. The only first teams of a club that had to compete in this round were FC Triesen and FC Triesenberg, while the other two teams eligible for the first round, FC Ruggell and FC Balzers II, received a bye. The games were played on August 18 – 19, 2009.
The six winners of the First Round, along with the two teams who had received a bye, competed in the Second Round. The first teams of FC Balzers, USV Eschen/Mauren, FC Schaan and FC Vaduz were all given a bye in this round. The games were played on September 15, 16 and 23, 2009.
The final, played between FC Vaduz and USV Eschen/Mauren was played in the national stadium, Rheinpark Stadion, which is also FC Vaduz' home-ground. At full-time the score was 1-1, but after penalties FC Vaduz had a winning scoreline of 4-2. The game was played on the 13th May 2010.