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Louis I, Landgrave of Thuringia | |
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 Louis I, Landgrave of Thuringia Statue | |
| Born | (?) (?) |
| Died | 12 January 1140 |
| Buried | Abbey of Reinhardsbrunn |
| Noble family | Ludovingians |
| Spouse(s) | Hedwig of Gudensberg |
| Issue | Louis II, Landgrave of Thuringia Judith of Thuringia |
| Father | Louis the Springer |
| Mother | Adelheid of Stade |
Louis I (died January 12, 1140) was ruler of Thuringia from 1123 to 1140.