John Seymour Lucas RA (21 December 1849 – 8 May 1923) was a Victorian English historical and portrait painter as well as an accomplished theatrical costume designer. He was born into an artistic London family, (he was the nephew of the painter John Lucas) and originally trained as a woodcarver, but turned his attention to portrait painting and entered first the St. Martin's Lane Art School and later the Royal Academy Schools. Here he met his French wife, fellow artist Marie Cornelissen, whom he married in 1877. Lucas' artistic education included extensive travels around Europe, particularly Holland and Spain, where he studied the Flemish and Spanish Masters. He first started exhibiting in 1872, was elected an associate member of the Royal Academy in 1876 and a full Royal Academician in 1898.