Jakub Kagan (7 February 1896 – 1942) was a popular Polish-Jewish composer, pianist, jazz musician and arranger. In the early 1920s, he formed the Kagan's Jazz Band in Warsaw, performing in operettas, cabarets, and hotels. Since 1922 Kagan was a feature artist at the Kabaret Mirage and at the Teatr Nowości. In 1926 he signed a contract with the luxury Hotel Bristol in Warsaw. His band performed world-renowned standards as well as his own compositions widely popular across the country.