An ariki, ꞌariki, aliki, ali‘i, ari'i, Rotuma) aiki or hakaiki, akariki or ‘eiki (Tonga) is or was a member of a hereditary chiefly or noble rank in Polynesia.

In the culture of the Māori of New Zealand, a tohunga is an expert practitioner of any skill or art, either religious or otherwise. Tohunga include expert priests, healers, navigators, carvers, builders, teachers and advisors. A tohunga may have also been the head of a whānau (family) but quite often was also a rangatira (chief) and an ariki (noble). The equivalent and cognate in Hawaiian culture is kahuna, tahu'a in Tahitian.