Walter Byset, Lord of Aboyne (died 1251) was a Scoto-Norman nobleman.
[1] Walter fled to Ireland and then to England with his nephew John Byset after they had been accused of involvement in the murder of Padraig, Earl of Atholl (his cousin in-law) and two companions at their lodgings after a tournament at Haddington in 1242.
Despite the king securing him in a number of safe houses he was eventually banished, with the loss of his estates, to England.
[5] Walter was received into the peace of King Henry III of England.
Walter was captured by Allan, the son of the Earl of Atholl, also in 1248 after Dunaverty Castle fell.