The 1908 Illinois gubernatorial election was held on November 3, 1908.

Charles Samuel Deneen was an American lawyer and Republican politician who served as the 23rd Governor of Illinois, from 1905 to 1913. He was the first Illinois governor to serve two consecutive terms totalling eight years. He was governor during the infamous Springfield race riot of 1908, which he helped put down. He later served as a U.S. Senator from Illinois, from 1925 to 1931. Deneen had previously served as a member of the Illinois House of Representatives from 1892 to 1894. As an attorney, he had been the lead prosecutor in Chicago's infamous Adolph Luetgert murder trial.