港海豹（学名：Phoca vitulina）是分布在北半球温带及极地海域的海豹。牠们出没于大西洋及太平洋的海岸水域，与及波罗的海及北海，是分布最广的鳍足类。

港海豹呈褐色、黄褐色或灰色，吻呈V状。成年港海豹长1.85米及重132公斤。雌海豹比公海豹长寿，可以活到30-35岁，雄性的寿命为20-25岁。牠们只会留在熟悉的环境，一般都是陆上掠食者不能到达的岩石地区，且有足够的鱼类食物供应。公海豹会在水中为交配而打斗，雌海豹会与较强壮的公海豹交配。每次只会生一胎，由雌海豹哺育。幼海豹出生后几小时内就懂得游泳及潜水，生长速度很快。牠们身体上有鲸脂来保暖。

The harbor (or harbour) seal (Phoca vitulina), also known as the common seal, is a true seal found along temperate and Arctic marine coastlines of the Northern Hemisphere. The most widely distributed species of pinniped (walruses, eared seals, and true seals), they are found in coastal waters of the northern Atlantic and Pacific oceans, the Baltic and North Seas.