Arthur Wellington Clah

Arthur Wellington Clah (1831–1916) was a Canadian First Nations employee of the Hudson's Bay Company at Lax Kw'alaams (Port Simpson), B.C., known for having written extensive journals detailing his life and that of others in the settlement in the late 19th century. He was a hereditary chief in the Tsimshian nation, an anthropological informant, and a Methodist missionary.

Arthur Wellington was his English name. "Clah" is a spelling of one of his hereditary Tsimshian names, Ła'ax. He also held the name T'amks, which carries with it leadership of a matrilineal house-group of the same name in the Gispaxlo'ots, one of the "Nine Tribes" of Lax Kw'alaams.