| Otto | |
| Count of Louvain | |
| Reign: | 1038 – 1040 |
| Predecessor: | Henry I |
| Successor: | Lambert II |
| Birth Name: | Otton de Louvain |
| Birth Date: | 2nd or 3rd decade, 11th century |
| Death Date: | c. 1040 |
| Father: | Henry I |
| Religion: | Catholic |
| Dynasty: | Reginarids |
Otto was Count of Louvain from 1038 through 1040. He was allegedly a legendary count.