圣罗伦斯县（Saint Lawrence County, New York）是位于美国纽约州东北部的一个县，北邻加拿大。面积7,308平方公里 (是该州面积最大的县)。根据美国人口调查局2000年统计，共有人口111,931人。

县治坎顿。名字来自圣罗伦斯河。

成立于1802年。

St. Lawrence County is a county located in the U.S. state of New York. As of the 2010 census, the population was 111,944. The county seat is Canton. The county is named for the Saint Lawrence River, which in turn was named for the Catholic saint on whose Feast day the river was discovered by French explorers.