In Insular Brythonic mythology, Amaethon was a god of agriculture, a son of Don and Beli.

He stole a dog, lapwing and roebuck from Arawn, leading to the Battle of Cath Godeau between the underworld gods and monsters and the children of Don. In this battle, Amaethon's brother, Gwydion, turned trees into warriors that helped the children of Don win.