John of Luxembourg (Jean de Luxembourg) (c. 1370 – bef. 2 July 1397, Italy^[1]), was Lord of Beauvoir (or Beaurevoir) and Richebourg, and also (as John II) Count of Brienne and Conversano (iure uxoris).

He was a member of the French branch of the House of Luxembourg, the son of Guy I of Luxembourg, Count of Ligny and Mahaut de Châtillon (1335–1378), Countess of Saint-Pol.^[2]

John married around 1387 with Margaret, Countess of Brienne, daughter of Louis of Enghien,^[3] suo jure heiress of the counties of Brienne and of Conversano, and the Lordship of Enghien.

They had five children:^[4]

• Peter I of Luxembourg (1390 – 31 August 1433), Count of Saint-Pol and Count of Brienne^[3]
• John II of Luxembourg, Count of Ligny (1392 – 5 January 1441),^[3] inherited the title of Beauvoir from his father, and the title of Ligny from his aunt, Jeanne of Luxembourg.
• Louis of Luxembourg (died 18 September 1443). He was a statesman and a high-ranking churchman.
• Catherine of Luxembourg (born c. 1393)
• Jeanne of Luxembourg (died 1420), married firstly, on 8 September 1415, Louis, Seigneur de Ghistelles (killed at the Battle of Agincourt); she married secondly on 28 October 1419, Jean IV, Viscount of Melun, Constable of Flanders.