弓鲛（学名Hybodus），又名弓鲨，是一属已灭绝的鲨鱼。牠们最初于二叠纪晚期出现，曾一度广泛分布，最终于白垩纪消失。在三叠纪、侏罗纪及白垩纪期间，弓鲛类的生存非常成功，遍布世界各海域的浅水区。牠们消失的原因不详。

弓鲛可以长达2米，相信是机会主义的掠食者。牠们并不怎么大型，但保持了鲨鱼流线的体型，有两条背鳍来精确控制身体。口部亦非很大，但亦可以吃多种的猎物。牠们拥有两种不同的牙齿，食性较广：尖锐的牙齿用来捕捉光滑的猎物，扁平的牙齿则用来咬碎有壳的生物。另外，牠们的背鳍是骨质的，相信是有防御功能。雄鲛有鳍脚，可以将精子插入雌鲛中来帮助繁殖，现今鲨鱼也保有这个特征。

Hybodus ("humped tooth") is an extinct genus of widespread and long-lived sharks, first appearing towards the end of the Permian period, and disappearing during the Late Cretaceous. During the Triassic, Jurassic, and Cretaceous periods the hybodonts were especially successful and could be found in shallow seas across the world. For reasons that are not fully understood, the hybodonts became extinct near the end of the Late Cretaceous period.