Henry Siddons Mowbray (August 5, 1858 – 1928) was an American artist.
He was born of English parents at Alexandria, Egypt. Left an orphan, he was taken to America by an uncle, who settled at North Adams, Massachusetts. After a year at the United States Military Academy at West Point, he went to Paris and entered the atelier of Leon Bonnat, his first picture, Aladdin, bringing him to public notice. He was made a full member of the National Academy of Design in 1891.