James Arthur Mathieu (August 21, 1869 – November 23, 1966) was known as "the last of the lumber kings," as well as "the Mighty Man of the Woods" and "the Lath King of America." Born in Alma, Wisconsin., he became an Ontario lumber merchant, philanthropist and political figure.
He represented Rainy River in the Legislative Assembly of Ontario initially as a Liberal-Conservative in 1911, and then as a Conservative from 1914 to 1923 and 1926 to 1929.