Ogma is a god from Irish and Scottish mythology. A member of the Tuatha Dé Danann, he is often considered a deity and may be related to the Gallic god Ogmios. According to the Ogam Tract, he is the inventor of Ogham, the script in which Irish Gaelic was first written.

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.