John Stewart, 3rd Earl of Lennox was born circa 1495 to Matthew Stewart, 2nd Earl of Lennox (c1472-1513) and Elizabeth Hamilton (1473-) and died 4 September 1526 of unspecified causes. He married Elizabeth Stewart (c1494-) 29 January 1511 JL .
Children
| Name | Birth | Death | Joined with |
| Matthew Stewart, 4th Earl of Lennox (1516-1571) | 21 September 1516 | 4 September 1571 | Margaret Douglas (1515-1578) |
| Robert Stewart, Earl of March (c1517-1586) | |||
| Helen Stewart (c1518-1564) | 1518 | 25 November 1564 Flanders | William Hay, 6th Earl of Erroll (c1521-1541) John Gordon, 11th Earl of Sutherland (1525-1567) James V, King of Scotland (1512-1542) |
| John Stewart, 5th Seigneur d'Aubigny (c1519-1567) | 1519 | 31 May 1567 | Anne de la Queuille (-c1579) |
| Elizabeth Stewart (c1520-bef1564) | |||
Footnotes (including sources)
| ‡ General |