Celtic mythology – also known as Gaelic and Gaulish mythology – is the collection of myths pertaining to ancient Celtic religion. Many of the most famous Celtic legends come from early Irish myths and include the gods of Ireland. However, in history, there were six Celtic nations whose mythologies are included in the broader Celtic mythos.

Celtic mythology is the collection of stories and folklore from various ancient Celtic cultures like the Irish, the Welsh, and the Gauls. Many of these myths were suppressed by Roman conquerors, with their first widespread recordings dating from the early medieval period.

Celtic mythology is the body of myths belonging to the Celtic peoples. Like other Iron Age Europeans, Celtic peoples followed a polytheistic religion, having many gods and goddesses.