圣罗伦斯湾（Gulf of Saint Lawrence）是加拿大东南部的大西洋海湾，圣罗伦斯河在这里流入北大西洋，位于拉布拉多半岛、纽芬兰、新伯伦瑞克与布雷顿角岛（Cape Breton Island）之间。

The Gulf of Saint Lawrence (French: Golfe du Saint-Laurent) is the outlet of the North American Great Lakes via the Saint Lawrence River into the Atlantic Ocean. The gulf is a semienclosed sea, covering an area of about 236,000 square kilometres (91,000 sq mi) and containing about 35,000 cubic kilometres (8,400 cu mi) of water, which results in an average depth of 148 metres (486 ft).