冷海（拉丁语：Mare Frigoris）是月球北极附近的一座月海。它坐落在风暴洋的外环内、雨海的北面，向东则延伸至澄海的北部，南面则是暗黑的柏拉图陨石坑。

环月海周边的盆地地层属早雨海世，但月海东部地层是晚雨海世代，而西部地层又为爱拉托逊纪。

Mare Frigoris (the "Sea of Cold") is a lunar mare in the far north of the Moon. It is located in the outer rings of the Procellarum basin, just north of Mare Imbrium, and stretches east to north of Mare Serenitatis. It is just north of the dark crater Plato.