Uniao Desportiva de Leiria, commonly known simply as Uniao de Leiria, is a Portuguese football club based in Leiria. They currently feature in the Portuguese Liga.
Uniao de Leiria were established in 1966 and are the most recently clubs in the Portuguese Superliga. They finished second in the second division in the 2008-2009 season and gained promotion to the Portuguese top flight for the 2009-2010 season.
Uniao de Leiria play their home matches at the Estadio Municipal de Leiria that can accommodate 30,000 spectators. They bear the nickname “The Ones from the Lis River”.