In Irish mythology, Aengus or Óengus is one of the Tuatha Dé Danann and probably originally a god associated with youth, love, summer and poetic inspiration. The son of The Dagda and Boann, Aengus is also known as Macan Óc, and corresponds to the Welsh mythical figure Mabon and the Celtic god Maponos. He plays a central role in five Irish myths.

Irish mythology is the body of myths indigenous to the island of Ireland. It was originally passed down orally in the prehistoric era. In the early medieval era, some myths were transcribed by Christian monks, who heavily altered and Christianised the myths. Irish mythology is the best-preserved branch of Celtic mythology.