Clarence E. Mathias (December 12, 1876 – December 9, 1935) was an American Sergeant Major serving in the United States Marine Corps during the Boxer Rebellion who received the Medal of Honor for bravery.

Mathias was born December 12, 1876, in Royalton, Pennsylvania, and after entering the Marine Corps he was sent as a private to China to fight in the Boxer Rebellion.

His grave can be found in section 6, lot 8681, map grid W/22.

[2] Rank and organization: Private, U.S. Marine Corps.

Citation: In the presence of the enemy during the advance on Tientsin, China, 13 July 1900, Mathias distinguished himself by meritorious conduct.