海雾是指受海洋与洋流影响下生成于海面上或海岸地区的一种雾的类型，一般可分为平流雾、蒸气雾、混合雾、辐射雾等四类。

另外，海雾也可以指：

• 海雾 (电影)，2014年韩国的一部电影。
• 海雾舰队，简称「海雾」，日本漫画作品《苍蓝钢铁战舰》中主要登场的舰队名称。

A marine layer is an air mass which develops over the surface of a large body of water such as the ocean or large lake in the presence of a temperature inversion. The inversion itself is usually initiated by the cooling effect of the water on the surface layer of an otherwise warm air mass. As it cools, the surface air becomes denser than the warmer air above it, and thus becomes trapped below it. The layer may thicken through turbulence generated within the developing marine layer itself. It may also thicken if the warmer air above it is lifted by an approaching area of low pressure. The layer will also gradually increase its humidity by evaporation of the ocean or lake surface, as well as by the effect of cooling itself. Fog will form within a marine layer where the humidity is high enough and cooling sufficient to produce condensation. Stratus and stratocumulus will also form at the top of a marine layer in the presence of the same conditions there.