William West Jr, ARCS, (11 February 1875 – 14 September 1901) was an English botanist. He was the elder son of the botanist William West, and the brother of George Stephen West. West assisted his father in fieldwork. He wrote papers on flowering plants and phycology for various journals. His official botanical author-abbreviation was W. West, although his authorship in journals was cited as W. West Jun.