House Dayne is a Dornish noble house sworn to House Martell, located in Starfall. Most of the people in House Dayne are stony Dornishmen, who are pale with violet eyes.

House Dayne was loyal to House Targaryen during Robert's Rebellion. The most famous member of House Dayne was Arthur Dayne 'The Sword of the Morning,' known as one of the most honest and true knights, and killed by Eddard Stark and his men when they stormed the Tower of Joy to find Lyanna Stark. Currently Edric Dayne is the Lord of House Dayne. He squired for Beric Dondarrion, who is betrothed to his aunt Allyria Dayne. The greatsword of House Dayne is named Dawn and was forged out of the core of a fallen star. It is said that only the most worthy of knights of the House Dayne can wield Dawn. Those who take the sword up gain the name 'The Sword of the Morning.'

Dawn had not been wielded since the death of Arthur Dayne. It is presumed to be stored in Starfall.