In Celtic religion and Irish mythology, Brigit or Brighid ("exalted one") is the daughter of the Dagda and one of the Tuatha Dé Danann. She was the wife of Bres of the Fomorians, with whom she had a son, Ruadán.

She had two sisters, also named Brighid, and is considered "a classic Celtic Triple Goddess".^{[dubious – discuss]}

She is identified in Lebor Gabála Érenn as a daughter of the Dagda and a poet. The same passage mentions that she has two oxen, Fe and Men, that graze on a plain named after them, Femen. She also possessed the "king of boars", Torc Triath, and Cirb, king of wethers (sheep), from whom Mag Cirb is named. As the daughter of Dagda, she is also the half sister of Cermait, Aengus, Midir and Bodb Derg.

In Cath Maige Tuireadh, Bríg (sic) invents keening while mourning for her son Ruadán, after he is slain while fighting for the Fomorians. She is credited in the same passage with inventing a whistle used for night travel.

In her English translation of Irish myth, Lady Augusta Gregory (Gods and Fighting Men, 1904), describes Brigit as "a woman of poetry, and poets worshipped her, for her sway was very great and very noble. And she was a woman of healing along with that, and a woman of smith's work, and it was she first made the whistle for calling one to another through the night. And the one side of her face was ugly, but the other side was very comely. And the meaning of her name was Breo-saighit, a fiery arrow."