Guillaume-Alphonse Nantel (November 4, 1852 – June 3, 1909) was a Canadian lawyer, journalist, author, newspaper owner, and politician. Born in Saint-Jérôme, Quebec, he was elected to the House of Commons of Canada as a Conservative candidate in the Quebec riding of Terrebonne in the 1882 federal election. He resigned less than two months later to allow Joseph-Adolphe Chapleau, the Secretary of State of Canada, to run for office. He died in Montreal in 1909. His brother, Wilfrid Bruno Nantel, was also a politician.