Mandamai Forest Reserve is a protected forest reserve in Pitas District of Kudat Division in Sabah, Malaysia. It was designated as a Class 1 Protection Forest by the Sabah Forestry Department in 1984. Its area is 5,330 hectares (53.3 km2). The reserve is hilly, with the highest point being Mount Mabauk at 836 metres (2,743 ft). Two forest types make up the reserve: dipterocarp and kerangas. The main threat to the reserve forests is from fires.