Ophelia Clemens (born c. 1877) was an American journalist. She was the daughter of Samuel Clemens. During the Great War and the interwar occupation of Canada, she wrote several stories unflattering to George Armstrong Custer, the military governor. While reporting on Custer, she met his adjutant, Abner Dowling. During the Second Great War, Clemens continued her work despite being over sixty years old. She wrote several scathing stories about General Daniel MacArthur's failure to capture Fredericksburg and the heavy casualties the U.S. Forces suffered in the attempts.