James John Fahnhorst (born November 8, 1958) is an American former professional football player who was a linebacker for the San Francisco 49ers in the National Football League (NFL) from 1984 through 1990.
He played college football for the Minnesota Golden Gophers, earning first-team All-Big Ten honors from AP and UPI in 1981.
Fahnhorst also played two years in the United States Football League (USFL) for coaching legend George Allen in the spring/summer of 1983 and 1984 for the Chicago Blitz and Arizona Wranglers.
He is currently a financial advisor and has coached college football at Division III Macalester College and at Wayzata and Maple Grove High Schools in the Minneapolis area.
This biographical article relating to an American football linebacker born in the 1950s is a stub.