John Kennedy, 6th Earl of Cassilis

John Kennedy, 6th Earl of Cassilis, PC (d. April 1668) was a Scottish peer, the son of Hew Kennedy, Master of Cassillis and Katherine Macdowall.

He succeeded to the titles of 8th Lord Kennedy and 6th Earl of Cassillis on 25 July 1616. He was a non-sitting member of Cromwell's House of Lords, and was invested as a Privy Counsellor of Scotland on 13 February 1660/61. He held the office of Justice-general 1649-1651 and of an Extraordinary Lord of Session for Scotland June 1661-July 1662.

He married Lady Jean Hamilton, daughter of Thomas Hamilton, 1st Earl of Haddington and Margaret Foulis, on 7 January 1621/22. They had three children:

He married Lady Margaret Hay, daughter of William Hay, 10th Earl of Erroll and Lady Anne Lyon, on 15 March 1643/44. They had one child:

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