Royal Standard de Liège, commonly referred to as Standard Liège (French: Standard de Liège [stɑ̃daʁ d(ə) ljɛʒ]; Dutch: Standard Luik [ˈstɑndɑrt ˈlœyk]; German: Standard Lüttich [ˈstandaʁt ˈlʏtɪç, ˈʃtan-]) or simply Standard in Belgium, is a Belgian professional football club based in the city of Liège.

They are one of the most successful clubs in Belgium, having won the Belgian league on ten occasions, most recently in 2007–08 and 2008–09. They have been in the top flight without interruption since 1921, longer than any other Belgian side. They have also won eight Belgian Cups, and in 1981–82 they reached the final of the European Cup Winners' Cup, which they lost 2–1 against Barcelona.

Standard players are nicknamed les Rouches [le ʁuʃ] because of their red jerseys. The French word for red, rouge, when pronounced with a Liège accent, sounds like rouche.

In March 2022, Standard Liège was acquired by US-based private investment firm 777 Partners. In October 2024 it was announced that 777 Partners were declared bankrupt by a London court, making the future ownership unclear.