Knudåge Riisager (6 March 1897 in Kunda, Russian Empire – 26 December 1974 in Copenhagen, Denmark[1]) was a Danish composer.

In 1923 he went to Paris to study with Albert Roussel and Paul Le Flem, where he experienced at first hand French neoclassicism and the music of Igor Stravinsky and Les Six.

Knudåge Riisager's international fame is largely due to his extensive work in ballet music, which was primarily a result of collaboration with Harald Lander.

The first work he composed for the Royal Danish Theatre was music for the ballet Benzin by Storm P. staged by Elna Ørnberg in 1930.

According to his entry in Grove, "Riisager became the most prominent representative of the French-orientated trend in Danish music of the interwar years".