A number of steamships have been named Mercator, including –
, a Finnish cargo ship in service 1891–1916. Torpedoed and sunk in 1916. , a Finnish cargo ship in service 1925–39. Torpedoed and sunk on 1 December. , a Finnish cargo ship in service 1942–44, 1948–59. Scrapped in 1959.
See also , a Landing Ship Tank, ex-USS LST-310. In service under this name between 1951 and 1963 for Norwegian, American and Argentinian owners.