吞鳗（学名：Eurypharynx pelecanoides），又称宽咽鱼，吞噬鳗，咽囊鳗、大嘴鳗、阔嘴鳗、巨口鳗等，是辐鳍鱼纲囊鳃鳗目宽咽鱼科的一个种，是较少见的深海鱼类，偶见于捕鱼网误捕。吞鳗很类似于鳗类，与鳗鲡目的真鳗联系上较为紧密；现在已知的种类仅此一属一种（Eurypharynx pelecanoides Vaillant, 1882）。其属名是以 eurys（拉丁文：长）+ pharynx（希腊文：喉头）构成，即“长喉咙”之意。

吞鳗分布于全球各大洋水域。已知生活的水域深度约 500 至 7625 公尺。

The pelican eel, Eurypharynx pelecanoides, is a deep-sea fish rarely seen by humans, though it is occasionally caught in fishing nets. It is an eel-like fish and the only known member of the genus Eurypharynx and the family Eurypharyngidae. It belongs to the order Saccopharyngiformes, which is closely related to the true eels in Anguilliformes. It is also referred to as the gulper eel, pelican gulper, and umbrella-mouth gulper. The specific epithet pelecanoides refers to the pelican, as the fish's large mouth is reminiscent of that of the bird.