John Cassell (Jack) Morrow (b. Belfast, 26 February 1872, d. Dublin, 11 January 1926) was a political cartoonist, illustrator and landscape painter. He was the son of a painter and decorator from Clifton Street, west Belfast. Of his seven brothers, four, Albert (1863-1927), George (1869-1955), Edwin (1877-1952) and Norman (1879-1917), were also cartoonists.