Jaroslav Ježek (September 25, 1906 – January 1, 1942) was a Czech composer, pianist and conductor, author of jazz, classical, incidental and film music.
The first part of his work consists of chamber, piano and concertant compositions, later he also became a popular jazz composer in pre-war Czechoslovakia. He composed songs and dances for the revue plays of the Prague Free Theatre and also for the films of Voskovec and Werich. Between 1929 and 1936, possibly earlier, he organized and conducted an orchestra featuring his original jazz compositions and arrangements. Billed variously as “Ježek’s Jazz” and “Ježkův swingband” they recorded for the Czech Ultraphon label, making some of the most original music in Europe.His innovative melodies are well known in the Czech Republic to this day.