Peter Stampfel (born October 29, 1938 in Milwaukee, Wisconsin) is an American fiddle player, violinist and singer-songwriter. He is perhaps best known for his work in the psychedelic folk band The Holy Modal Rounders. Stampfel was also briefly a member of The Fugs and has been the leader of several musical projects including The Bottlecaps and the WORM All-Stars. He's also performed with They Might Be Giants, The Roches, Yo La Tengo, Bongwater, Jeffrey Lewis, Michael Hurley and Loudon Wainwright III.