Forrest Allen Loudin (February 26, 1890 – September 15, 1935) was an American football, basketball, and baseball coach.

Previously he had also coached and taught science and athletics high school in Iowa.

[3][4] Loudin was also professor of Mathematics and Physical Director at his time at Carthage.

[1] He died at Keokuk, Iowa in 1935 of an illness contracted during his overseas service in World War I.

This biographical article relating to a college football coach first appointed in the 1910s is a stub.