鸡胸（英语称为Pectus carinatum 或 pigeon chest），是胸骨向前隆起，是一种常见的胸廓畸形。病因因人而异。与之相对的是漏斗胸。很多小孩鸡胸长大以后都会减轻。治疗鸡胸的一个方法是带上胸箍（chest-wall brace），此外可以做手术。成人可以通过健身的方式来隐藏他们的状况。

Pectus carinatum (L carīnātus, equiv. to carīn(a) keel), also called pigeon chest, is a deformity of the chest characterized by a protrusion of the sternum and ribs. It is distinct from the related deformity pectus excavatum.