John Asher Dunn (June 19, 1939 – July 4, 2017) was an American linguist who created the first academic dictionary and grammar of the Tsimshian language, an American Indian language of northwestern British Columbia and southeast Alaska. He published his dictionary and grammar of the Tsimshian language (now known as Sm'algyax) in 1978 and 1979 respectively. They were reissued in a single volume in 1995 by the Sealaska Heritage Foundation. He was a retired professor of linguistics at the University of Oklahoma in Norman, Oklahoma.