William J. Wadsworth (died March 20, 1949) was a Canadian businessman and politician. He was a long serving municipal politician in Toronto, Ontario. He was born in Flesherton, Ontario and migrated to Toronto when his family moved to the West Toronto Junction while he was still a youth. He worked for 15 years at the treasury department at Toronto City Hall and then left to work in the coal business. It was here that he founded and served as president of the Wadsworth Coal Company. He retired from politics and was given a posting of LCBO inspector. He died of a stroke in 1949 at age 63.