Polynesian outliers are a number of culturally Polynesian societies that lie outside the main region of Polynesian influence, known as the Polynesian Triangle; instead, Polynesian outliers are scattered in the two other Pacific subregions: Melanesia and Micronesia.
The region commonly termed "Polynesia" includes thousands of islands, most of them arranged in a rough triangle bounded by Hawaii, Easter Island, and New Zealand. Outside the Polynesian Triangle, in areas commonly designated Micronesia and Melanesia, lie about two dozen islands, most of them small and widely separated, whose inhabitants speak Polynesian languages. These islands are collectively termed the Polynesian "outliers"
Their residents generally share features found within Triangle Polynesia. Physically, Polynesians tend to have brown complexions and dark, wavy hair, and they are typically large people of muscular build.
The fact that people in all of the Polynesian outliers speak recognizably Polynesian languages implies that their ancestors fairly recently migrated from the Polynesian heartland. Yet there is much social variation. In some places, outlier populations settled in close proximity to Melanesian or Micronesian populations and seem to have been influenced by them. In other locations, outlier populations remained isolated by geography, ecology, or choice and seem more classically Polynesian.
The Federated States of Micronesia has two outlier cultures, Kapingamarangi and Nukuoro. Papua New Guinea has four : Nuguria, Nukumanu, and Takuu Vu'ula or Hula. The country with the most outlier cultures is the Solomon Islands, with seven: Anuta, Bellona, Ontong Java, Rennell, Sikaiana, Tikopia, and Vaeakau-Taumako. Vanuatu has three: Emae, Makura, Mele (Erakoro, Eratapu) stemming from Rarotonga, (Aniwa) and Futuna. Futuna recognizes links with Tonga. The principal outlier culture in New Caledonia is on Ouvéa in the Loyalty Islands, where the Fagauvea language is spoken.
The links of these people are multiple. 
The outlier groups in Micronesia, Papua New Guinea, and the northern Solomon Islands speak Ellicean languages (which also includes Tuvaluan), while those further to the south in the Solomons, Vanuatu, and New Caledonia speak Futunic languages (which also includes the language of Wallis and Futuna). These are two of the branches of the Samoic language family, which is sometimes called the Samoan-Outlier language family for this reason. It is a sub-branch of the Nuclear Polynesian languages. In some of these islands, the outlier population may also speak the local Melanesian or Micronesian language.
A 1983 study analyzing the DNA of 2400 people in the Solomon Islands and Vanuatu have found markers which clearly distinguish the Polynesian outlier islands of the group. Of the four Polynesian outliers considered, Anuta was the most genetically distinct, followed by Rennell and Bellona. Tikopia showed more influence from the nearby Melanesian population. All indicate traces of inter-island population movements, and even sources from Europeans, Africans, and Asians, though the latter were at a low level.