Occo of Schleswig (also Aage, Aagge, Ogge) was the bishop of the Diocese of Schleswig between 1141 and 1145 and again from 1161 to 1167. The chapter of Schleswig Cathedral elected Occo bishop in 1138, after Bishop had been elected the new bishop of Roskilde. However, Eric III Lamb imposed his chaplain Hermann, who was born in the Holy Roman Empire. So Occo was hindered to ascend the see. The city of Schleswig and the diocesan clergy preferred the Bishop elect Occo and after unrest among the townsfolk Hermann resigned, and Occo ascended. Eric Lamb provided for Hermann with another position.