Charles William Clark (15 October 1865 – 4 August 1925) was an American baritone singer and vocalist teacher. He is generally regarded as the first American baritone singer to be famous in Europe, and as one of the greatest baritone singers of all time. He sang to great acclaim at the major opera houses of Europe and America, appearing in a wide variety of roles from the Italian, French and German repertoires that ranged from the lyric to the dramatic.