Gulf of St. Lawrence babban ruwa ne na ruwan gishiri da ke gabashin Kanada, kusa da bakin tekun lardunan Quebec, New Brunswick, da Newfoundland da Labrador. Yana daga cikin Tekun Atlantika kuma an haɗa shi da Tekun Maine ta mashigin Cabot. Gulf of St. Lawrence sananne ne don ɗimbin halittun ruwa kuma yanki ne mai mahimmanci don kamun kifi da jigilar kaya.
