| Otto, Lord of Lippe | |
| Noble Family: | House of Lippe |
| Father: | Simon I, Lord of Lippe |
| Mother: | Adelaide of Waldeck |
| Spouse: | Irmgard of the Marck |
| Death Place: | Lemgo |
Otto, Lord of Lippe ( -) was the ruling Count of Lippe-Lemgo from 1344 until his death.
He was the son of Simon I and his wife, Adelaide of Waldeck.
When his father died in 1344, Lippe was divided; Otto ruled the area around Lemgo, while his brother Bernard V ruled the area around Rheda.
Otto resided in Lemgo, which at the time consisted of two legally separate town: the Old Town and the New Town. In 1365, five years after Otto's death, these were amalgamated to form the Town of Lemgo.
Otto was married to Irmgard of the Marck, daughter of Engelbert II of the Mark. They had three children: