Oluf Haraldsen (died 1141 or 1143) was a Danish nobleman that ruled Scania for a few years around 1140. He never won control over the rest of the country and he is not included in the lists of Danish monarchs used by the Danish monarchy and Den Store Danske Encyklopædi'.' The leader of a peasant rebellion in Scania about 1182 is said to have been Olaf's illegitimate son but their relationship is unsure.