| Maria of Loon-Heinsberg | |
|---|---|
| Spouse(s) | John IV, Count of Nassau |
| Noble family | House of Loon |
| Father | John II of Loon, Lord of Jülich, Heinsberg and Löwenberg |
| Mother | Margaret of Solms-Braunfels |
| Born | 1426 |
| Died | 20 April 1502 |
| Buried | Mausoleum of Engelbert I of Nassau in Breda |
Maria of Loon-Heinsberg (1426 – 20 April 1502) was the daughter of John II of Loon, Lord of Jülich, Heinsberg and Löwenberg. Her mother was the second wife of John II, Countess Margaret of Solms-Braunfels.
Maria died on 20 April 1502 as the last member of the house of Loon-Heinsberg and is buried with her husband in the mausoleum of Engelbert I of Nassau in the Church of Our Lady at the Market Square in Breda.
She married on 7 February 1440 with John IV, Count of Nassau, Lord of Breda. They had the following children: