| John of Luxembourg | |
| Succession: | Lord of Beauvoir and Richebourg as John I |
| Reign: | 1387–1397 |
| Predecessor: | Waleran III |
| Successor: | John II |
| Succession1: | Count of Brienne and Conversano, Lord of Enghien as John II |
| Reign1: | 1394–1397 with Margaret, Countess of Brienne |
| Predecessor1: | Louis, Count of Enghien |
| Successor1: | Peter I of Luxembourg |
| Spouse: | Margaret, Countess of Brienne (1387–1397) |
| Issue: | Peter I of Luxembourg John II of Luxembourg, Count of Ligny Louis of Luxembourg Catherine of Luxembourg Jeanne of Luxembourg |
| House: | House of Luxembourg |
| Father: | Guy I of Luxembourg |
| Mother: | Mahaut of Châtillon |
| Death Date: | bef. 2 July 1397 |
| Death Place: | Italy |
John of Luxembourg (Jean de Luxembourg) (– bef. 2 July 1397, Italy[1]), was Lord of Beauvoir (or Beaurevoir) and Richebourg, and also (as John II) Count of Brienne and Conversano (Latin: [[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. Blessed Pierre de Luxembourg was his brother.
John married around 1387 with Margaret, Countess of Brienne, daughter of Louis of Enghien, Latin: [[suo jure]] heiress of the counties of Brienne and of Conversano, and the Lordship of Enghien.
They had five children:[2]