William Lorne Northmore Somerville, QC (August 24, 1921 – June 10, 2009), was a Canadian lawyer from Toronto, Ontario, Canada. He spent his career in private practice with the firm of Borden & Elliot, one of Canada's largest law firms (now Borden Ladner Gervais). For the last ten years of his career, he served as chairman of the firm. He also served as President of the Canadian Bar Association from 1974 to 1975.