Leonidas Hubbard Jr. (1872–1903) was an American journalist and adventurer. He was born in Michigan and studied at the University of Michigan (1893–97), choosing journalism as a career. In 1901 he married Mina Adelaine Benson, a woman two years senior and at the time an assistant superintendent of a Staten Island hospital. They met at the hospital when Hubbard was ill with typhoid fever. He became an assistant editor of Outing magazine and in 1903 led an expedition to canoe the system Naskaupi River–Michikamau Lake in Labrador and George River in Quebec. His companions on this journey were his friend, New York lawyer Dillon Wallace and an Indian guide from Missanabie, George Elson.