Seth Arnold (1885 – January 3, 1955) was an American theater and film character actor.
After his family moved back to the United States, Seth joined the Castle Square Stock Company in Boston in 1901.
He played another physician in 1928's Quicksand and starred in Steel (1931), Mourning Becomes Electra (1932), Pursuit of Happiness, Tommy and Unto the Third (1933), Symphony (1935) and Ah, Wilderness!
He also starred in Lady Lucky in 1936 and as Doremus Jessup in 1937's It Can't Happen Here by Sinclair Lewis.
In 1947, he left Broadway to appear in the Hollywood version of Mourning Becomes Electra but was forced out of the cast by illness.