Seppo Harjanne (born 20 February 1948) is a Finnish former rally co-driver.

With Salonen, Harjanne took ten World Rally Championship victories for the factory teams of Datsun, Peugeot and Mazda, and the 1985 drivers' world championship title in a Peugeot 205 Turbo 16 E2.

With Mäkinen, competing mainly for the Team Mitsubishi Ralliart, he won ten more WRC events along with the 1996 and 1997 drivers' titles in a Lancer Evolution.

At the time of his retirement, Harjanne held the co-driver records for most wins and most titles (tied with Juha Piironen) in the WRC.

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