Theodore Debs (August 20, 1864 – April 13, 1945) was an American socialist and political activist. Debs is best remembered as the personal secretary and political confidant of his older brother, socialist orator and journalist Eugene V. Debs. A political actor in his own right, the younger Debs was the executive secretary of the Social Democratic Party of America with headquarters in Chicago from its foundation in 1898 until its dissolution through merger into the Socialist Party of America in August 1901.