James Elmore Ostendarp (February 15, 1923 – December 15, 2005) was an American gridiron football player and coach. He played professional football for the New York Giants of the National Football League (NFL) from 1950 to 1951 and the Montreal Alouettes of the Interprovincial Rugby Football Union—a forerunner of the Canadian Football League (CFL)—in 1952. Ostendarp was the head football coach at Amherst College for 33 years, from 1959 to 1991, compiling a record of 168–91–5. He also served as president of the American Football Coaches Association in 1982.