George John Pinwell RWS (London 26 December 1842 – 8 September 1875 London), was a British watercolour painter.
Pinwell received his art education at educated at St. Martin's Lane Academy and Heatherley's Academy. He belonged to the small group of watercolour painters which included Frederick Walker and Arthur Boyd Houghton, whose style came from drawing on wood for book illustration. His career was cut short by an early death.
He came from a poor background, but in 1862 he entered Heatherley's studio and there obtained his art education. His earliest drawings appeared in Littiput Levée. He did a little work for the periodical Fun and executed several designs for the silversmiths Elkington's. He worked for Josiah Wood Whymper and through him met J W North and Fred Walker. In 1863 his first drawing appeared in Once a Week and from that time his work was in constant demand. There were many of his compositions in Good Words, The Sunday Magazine, The Quiver and London Society, and he subsequently illustrated for the Dalziel Brothers' editions of Oliver Goldsmith, of Jean Ingelow's poems, Robert Buchanan's Ballads of the Affections, and the Arabian Nights. Best-known were two scenes from the Pied Piper of Hamelin, Gilbert à Becket's Troth, Out of Tune (or The Old Cross), A Seat in St James's Park (1869; Art Gallery of New South Wales, Sydney) and The Elixir of Life.