John Stewart, 3rd Earl of Lennox

John Stewart, 3rd Earl of Lennox (c. 1490-4 September 1526, Linlithgow, West Lothian) was a prominent Scottish magnate. He was the son of Matthew Stewart, 2nd Earl of Lennox, and Elizabeth Hamilton, daughter of James Hamilton, 1st Lord Hamilton and Mary Stewart, Princess of Scotland, daughter of King James II of Scotland.
The Earl of Lennox led an army to Linlithgow with the intention of liberating the young King James V from the pro-English Douglases. He was defeated by a smaller force led by the Earl of Arran at the Battle of Linlithgow Bridge. He survived the battle and was taken captive only to be subsequently murdered by James Hamilton of Finnart. Lennox was succeeded by his son Matthew Stewart, 4th Earl of Lennox, the father of Henry Stewart, Lord Darnley and grandfather of James VI of Scotland.

On 19 January 1511 he married Elizabeth Stewart, daughter of John Stewart, 1st Earl of Atholl, and Eleanor Sinclair, daughter of William Sinclair, 3rd Earl of Orkney. They had issue:

• Matthew Stewart, 4th Earl of Lennox
• Robert Stewart, 6th Earl of Lennox
• John Stewart, 5th Lord of Aubigny
• Helen or Eleanor Stewart, married; firstly, William Hay, 6th Earl of Erroll; secondly John Gordon, 11th Earl of Sutherland
• Elizabeth Stewart, who married Ninian Ross; Mistress of James V of Scotland, mother of Adam Stewart Prior of Perth Charterhouse

• Sir James Balfour Paul, The Scots Peerage, Volume I (Stewart, Earl of Atholl) and Volume VII (Ross of Halkhead)