Omarumutu is a community in the Ōpōtiki District and Bay of Plenty Region of New Zealand's North Island, located near the mouth of the Waiaua River. The area includes large tracts of Māori freehold land. Neighbouring localities are Opape, on the coast 2 km (1.2 mi) to the east, and Waiaua, 2 km (1.2 mi) inland.