Teuvo Pentti "Tepi" Länsivuori (born 9 December 1945) is a Finnish former professional motorcycle road racer.
He competed in the Grand Prix world championship where he had his most successful years in 1973 when he finished in second place behind Giacomo Agostini in the 350cc World Championship, second in the 250 championship to Dieter Braun, and in 1976 when he as a privateer finished second to his former Suzuki team-mate Barry Sheene, in the 500cc world championship.