Wallace Alexander Nelson (29 April 1856 – 5 May 1943) was a short term Western Australian politician.

He represented the electoral district of Hannans from 1904 to 1905 in the Western Australian Legislative Assembly.

Born in Aberdeen, Scotland, Nelson had been ordered to relocate to a warmer climate by his doctor in Sheffield, England the 1880s, and subsequently immigrated to Brisbane and then Rockhampton.

After two years in England, he moved to Sydney in 1916 where he edited the Australasian Manufacturer until a few months before his death in 1943.

Nelson was an official lecturer on the Great White Train tour of New South Wales country towns in 1925–26.