Forest Arthur Harness (June 24, 1895 – July 29, 1974) was an American lawyer, World War I veteran, and politician who served five terms as a U.S. Representative from Indiana from 1939 to 1949.

Born in Kokomo, Indiana, Harness attended public schools and graduated in 1917 from the law department of Georgetown University, Washington, D.C. where he was a member of the Delta Chi fraternity.

He served overseas during World War I as a first lieutenant, Three Hundred and Nineteenth Infantry from 1917 to 1919, for which he was awarded the Purple Heart.

In September 1944, Harness claimed on the House floor that the Australian government warned Washington (prior to the attack on Pearl Harbor) that a Japanese aircraft carrier was bound for Hawaii and that this information was withheld from the commanders at Pearl Harbor.

This article incorporates public domain material from the Biographical Directory of the United States Congress