Peter Ostroushko (August 12, 1953 – February 24, 2021) was an American violinist and mandolinist. He performed regularly on the radio program A Prairie Home Companion and with a variety of bands and orchestras in Minneapolis–Saint Paul and nationally. He won a regional Emmy Award for the soundtrack he composed for the documentary series Minnesota: A History of the Land(2005).

Born August 12, 1953, and of Ukrainian ancestry, Ostroushko grew up in northeast Minneapolis where he first took up mandolin at age three.