Worthington George Smith (23 March 1835 – 27 October 1917) was an English cartoonist and illustrator, archaeologist, plant pathologist, and mycologist.

Worthington G. Smith's particular expertise was in fungi, which he collected, studied, and illustrated. He published extensively, writing over 200 articles and papers, as well as several books. His first major work in 1867 was to produce coloured illustrations of poisonous and edible fungi, printed in linen-backed poster format with an accompanying booklet. He published Clavis Agaricinorum (a key to British agarics) in 1870, wrote a popular book on mushrooms and toadstools in 1879, illustrated Stevenson's Hymenomycetes Britannici in 1886, and produced a supplement to M.J. Berkeley's Outlines of British Fungology in 1891.