食蟹海豹（学名：Lobodon carcinophagus），也称锯齿海豹，是分布于南极大陆附近海域的一种海豹。

成年雄性食蟹海豹体长2.16～2.41米；雌性2.03～2.41米，重200～300公斤。嘴脸甚长。颊齿复杂，上、下颌各有5枚颊齿，各齿的主尖头前有1个、后有3个齿冠尖头，适于过滤食物。主要以南极磷虾为食。喜独栖，在冰上行动迅速。

食蟹海豹是食蟹海豹属下唯一的一种，其属名（Lobodon）来自希腊语，意为“锯齿状牙齿”。种名（carcinophagus）意为“食蟹的”，曾错误的认为蟹是其食物。

The crabeater seal (Lobodon carcinophaga or carcinophagus) is a true seal with a circumpolar distribution around the coast of Antarctica. They are medium- to large-sized (over 2 m in length), relatively slender and pale-colored, found primarily on the free-floating pack ice that extends seasonally out from the Antarctic coast, which they use as a platform for resting, mating, social aggregation and accessing their prey. They are by far the most abundant seal species in the world. While population estimates are uncertain, there are at least 7 million and possibly as many as 75 million individuals. This success of this species is due to its specialized predation on the abundant Antarctic krill of the Southern Ocean, for which it has uniquely adapted, sieve-like tooth structure. Indeed, its scientific name, translated as "lobe-toothed (lobodon) crab eater (carcinophagus)", refers specifically to the finely lobed teeth adapted to filtering their small crustacean prey. Despite its name, crabeater seals do not eat crabs. As well as being an important krill predator, the crabeater seal is an important component of the diet of leopard seals (Hydrurga leptonyx), which consume about 80% of all crabeater pups.