圣爱任纽（或译圣依勒内，圣公会译圣爱纳内，英文：Irenaeus；希腊文：Ειρηναίος，130年－202年），基督教主教，早期神学家。他的著作开启了早期基督教神学的发展，并且被罗马公教会和正教会封为圣徒和教父。他是早期基督教的护教学家，据信是使徒约翰的弟子坡旅甲的门徒。

爱任纽出生于公元二世纪初的小亚细亚希腊裔家庭。这也许是他一直追随东正教派的原因。

爱任纽是最早将现今《圣经》正典的四部福音书列为神所启示，反驳马吉安删改的路加福音是唯一正统福音书的立场。

Irenaeus (/aɪrəˈniːəs/; Greek: Εἰρηναῖος) (early 2nd century – c. AD 202), also referred to as Saint Irenaeus, was Bishop of Lugdunum in Gaul, then a part of the Roman Empire (now Lyon, France). He was an early Church Father and apologist, and his writings were formative in the early development of Christian theology. A resident of Smyrna, he had listened to the preaching of St. Polycarp. Polycarp is traditionally considered a disciple of John the Evangelist.