| Louis I, Count of Nassau-Weilburg | |
| Noble Family: | House of Nassau |
| Father: | John III, Count of Nassau-Weilburg |
| Mother: | Elisabeth of Hesse |
| Spouse: | Margaret of Nassau-Wiesbaden |
| Birth Date: | 1473 |
Count Louis I of Nassau-Weilburg (1473 - 28 May 1523) was a son of Count John III of Nassau-Weilburg and his wife, Elisabeth of Hesse. In 1492, Louis I succeeded his grandfather Philip II as Count of Nassau-Weilburg, because his father had already died in 1480.
In 1502, Louis I married Margaret (1487–1548), a daughter of Adolf III of Nassau-Wiesbaden-Idstein and Margarethe von Hanau-Lichtenberg. Louis and Margaret had the following children: