Peter Stampfel (born October 29, 1938, in Wauwatosa, Wisconsin is an American fiddle player, old-time musician, and singer-songwriter.

Stampfel is best known as a member of the Holy Modal Rounders, a psychedelic folk band that he founded with Steve Weber in the early 1960s. He was also briefly a member of the Fugs and has been the leader of several musical projects, including the Bottlecaps, the Du-Tels, and the WORM All-Stars. He has performed with They Might Be Giants, the Roches, Yo La Tengo, Bongwater, Jeffrey Lewis, Michael Hurley, Baby Gramps and Loudon Wainwright III.
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