Alexander Dew Chaplin (10 April 1872 – 18 January 1938) was a Conservative member of the Canadian House of Commons. He was born in Port Granby, Ontario and became a manufacturer.The son of William Lamont Chaplin and Harriet Dew, he was educated in St. Catharines and Toronto.Chaplin was managing director and secretary-treasurer for the Chatham, Ontario based Hayes Wheel Company of Canada.He was first elected to Parliament at the Kent, Ontario riding in the 1925 general election.