David Kennedy, 1st Earl of Cassilis (before 1478 – 9 September 1513) was a Scottish peer, the son of John Kennedy, 2nd Lord Kennedy. Invested as a Knight on 29 January 1487/88 by King James III, he wed Lady Isabel Campbell, daughter of Archibald Campbell, 2nd Earl of Argyll by Lady Elizabeth Stewart before July 1489. At some point before 1500, she bore him a son, Gilbert. Gilbert Kennedy, 2nd Earl of Cassillis (died between 24 and 30 August 1527) was a British peer, the son of David Kennedy, 1st Earl of Cassilis and Agnes Borthwick.