Pelle Helmer Petterson (born 31 July 1932) is a Swedish sailor and yacht designer. He is the son of Helmer Petterson and Norwegian-born Borgny Petterson (born Holm), and studied design at the leading Pratt Institute in New York from 1955 through 1957. He is probably best known for designing the Maxi brand of sailing boats, which are still among the most common sailing boats in Swedish waters. He also designed Volvo's successful sports car, the P1800, while he was a student of Pietro Frua.