Henry Atwell Thomas (1834 -1904) was an American artist active in the middle to late 19th century. Thomas worked primarily in watercolor, printmaking, and lithography. Thomas was most active in New York City where he was known for theatrical portraiture. Initially he operated as 'H. A. Thomas Lithographer'. Eventually Thomas acquired various partners with publications under as 'Thomas and Eno' and 'Thomas and Wylie'. He subsidized his theater work with general interest prints and paintings related to monuments and historical events. In 1886, he was recognized with an art, music and drama festival at the Academy of Music presented as a "Testimonial to Henry A. Thomas, Artist."