Clement Edson Warner (February 23, 1836 – May 20, 1916) was an American farmer, Republican politician, and Union Army officer in the American Civil War. He served with the 36th Wisconsin Infantry Regiment and commanded the regiment near the end of the war. He later served in the Wisconsin State Senate (1867–1869) and the Assembly (1883–1885), representing Dane County. In historical documents, his name is frequently abbreviated as C. E. Warner.