Angus Og MacDonald (died 8 July 1615) was a son of Angus MacDonald, 8th of Dunnyveg and Mary, daughter of Hector Og Maclean of Duart.
He tried to negotiate a lease of crown lands on Islay, the rights to Dunyvaig Castle, and a pardon for all crimes up to date with Andrew Knox for the surrender of Dunyvaig Castle.
The Privy Council, refused these terms and directed Knox to capture the castle by force.
The hostages were released on assurances from John Graham that the royal expedition would be called off.
On 6 January 1615, Sir John Campbell of Calder, with the assistance of Sir Oliver Lambart, laid siege to Dunyvaig Castle and captured it and took Angus Og as a prisoner.