Oskar Joost (9 June 1898 – 29 May 1941) was a German musician, who played violin, tenor saxophone and clarinet, as well as directing a dance orchestra.

Joost was born into a musical family in Wissembourg, Alsace on 9 June 1898.

Oskar attended high school in Leipzig and participated in the First World War as a volunteer.

From 1930, the Orchestra began playing in the Berlin Eden hotel, which led to a recording contract with Electrola, followed by subsequent contracts with other record labels: Pallas (1931), Crystal (1931–1934), Ultraphon/Telefunken (1932), Grammophon/Polydor (1934–1941).

When Oskar was enlisted in January 1940, his orchestra continued under Rudi Juckeland.