Louis IV | |
|---|---|
| Landgrave of Thuringia | |
 Louis IV of Thuringia, liber depictus, Český Krumlov, 14th century | |
| Born | 28 October 1200 Creuzburg Castle, Thuringia |
| Died | 11 September 1227 (aged 26) Otranto, Kingdom of Sicily |
| Buried | Reinhardsbrunn Abbey |
| Noble family | Ludovingians |
| Spouse(s) | Elizabeth of Hungary |
| Issue | Hermann II, Landgrave of Thuringia Sophie of Thuringia, Duchess of Brabant Gertrude of Aldenberg |
| Father | Hermann I, Landgrave of Thuringia |
| Mother | Sophia of Wittelsbach |
Louis IV the Saint (German: Ludwig IV. der Heilige; 28 October 1200 – 11 September 1227), a member of the Ludovingian dynasty, was Landgrave of Thuringia and Saxon Count palatine from 1217 until his death. He was the husband of Elizabeth of Hungary.