加州海狮（Zalophus californianus）是一种原产北太平洋的海狮品种。雄性长大后可达2.4米长，重300公斤；雌性长大后则有2米长，100公斤重。

加州海狮的食物广泛，主要有鱼、鱿鱼等海鲜，偶有机会亦会捕食海鸟。

加州海狮群是最大型的哺乳动物群之一。雄性海狮于每年6月初何会创建地盘。雌性则于6月中才会来到，一两天后便交配。诞下小海狮约一星期后，成年海狮又可再次交配。加州海狮的乳汁也是所有哺乳动物当中唯一一种不含乳糖成份的。

加州海狮经驯服后，可被用作表演或军事用途。

在美国旧金山三十九号码头（渔人码头）外，人们常常可以近距离看到不少加州海狮享受日光浴。

The California sea lion (Zalophus californianus) is a coastal eared seal native to western North America. It is one of five species of sea lion. Its natural habitat ranges from southeast Alaska to central Mexico, including the Gulf of California. Sea lions are sexually dimorphic, males are larger than females, and have a thicker neck and protruding crest. They mainly haul-out on sandy or rocky beaches, but they also frequent manmade environments such as marinas and wharves. Sea lions feed on a number of species of fish and squid, and are preyed on by Orcas and white sharks.