In Irish mythology, Bres, aka Eochaid Bres, Eochu Bres ("Eochaid/Eochu the Beautiful"), was a king of the Tuatha Dé Danann. His parents were Prince Elatha of the Fomorians and Ériu. He grew so quickly that by the age of seven he was the size of a 14-year-old.

In the First Battle of Magh Tuiredh, King Nuada of the Tuatha Dé Danann lost his hand; because he was imperfect, he could not be king. Hoping to reconcile relations between the Fomorians and the Tuatha Dé Danann, Bres was named king and Brigid of the Tuatha de Danaan married him.

Bres made the Tuatha Dé pay tribute to the Fomorians and work as slaves: Ogma was forced to carry firewood, and the Dagda had to dig trenches around forts. He neglected his duties of hospitality: the Tuatha Dé complained that after visiting his house their knives were never greased and their breaths did not smell of ale. Cairbre, poet of the Tuatha Dé, composed a scathing poem against him, which was the first satire in Ireland, and everything went wrong for Bres after that.

After Bres had ruled for seven years, Nuada had his hand replaced with a superior, silver one by Dian Cecht and Creidhne, and was restored to the kingship. Bres was exiled. He went to his father for help to recover his throne, but Elatha would not help him gain by foul means what he had been unable to keep by fair, so Bres turned instead to Balor, another leader of the Fomorians.

He led the Fomorians in the Second Battle of Magh Tuireadh but lost. He was found unprotected on the battlefield by Lug and pleaded for his life. Lug spared him because he promised to teach the Tuatha Dé agriculture.