Te Whareumu (?–1828) was the ariki and warrior chief of Ngāti Manu, a hapū within the Ngāpuhi iwi based in the Bay of Islands in New Zealand.
Te Whareumu was the most important chief in the Kororakeka area in his day. He was a warrior chief of the highest mana in pre-European times and well respected by the early missionaries and traders, to whom he provided the greatest protection. Te Whareumu quickly realised the advantage of trading with the many ships visiting the Bay.
Born in the late 18th century, possibly about 1770-80, into a high ranking family, Te Whareumu was the son of Te Arahi and Te Ruru. He was closely related to Te Ruki Kawiti and Pōmare I (also called Whetoi) and related to most of the northern chiefs. Te Whareumu assumed control of the tribe after the passing of Tara. Also known as Uruti and 'King George'.
One of Te Whareumu's wives was Moehuri, daughter of Mohi Tawhai, an important chief of the Mahurehure tribe. Another wife was Whakakati, mother of Hori Kingi Tahua and at least three more children. He also married the wife of Tara, who was called Mrs Go-Shore, a term brought about from her boarding the ships in the harbour and telling them to come ashore.
Koriwhai of the Ngāpuhi, had been murdered by some members of the Ngāti Whātua and Ngāti Maru tribes. This murder bought back memories of the defeat that the Ngāpuhi had suffered at Moremonui. So Hongi Hika decided to help Te Whareumu, to whom Koriwhai was related, and at the same time use the opportunity to wipe out their warlike neighbours of the Kaipara. So the Ngāpuhi assembled under Hongi Hika 500 strong and after the usual haka, the taua (war party) proceeded by way of the Mangakahia Valley. With them was the Roroa chief, Te Hihi-o-tote who was related to the Ngāpuhi and to the Ngāti Whātua. Te Hihi managed to stop Hongi Hika from destroying his relatives by presenting the warrior with a fine old mere (greenstone weapon). Hongi turned back and when Te Whareumu found out, he was very angry and immediately set out to sea with his own taua. He landed at Mangawhai with nearly 200 men and marched inland to confront the enemy. Meanwhile, Hongi Hika had started out again with 300 warriors overland, within this party were many different chiefs of the Ngāpuhi, including Te Ahu, Patuone, Tāmati Wāka Nene, Te Morenga and others.