Pacific Islanders, Pasifika, Pasefika, Pacificans, or rarely Pacificers are the peoples of the Pacific Islands. As an ethnic/racial term, it is used to describe the original peoples—inhabitants and diasporas—of any of the three major subregions of Oceania (Melanesia, Micronesia, and Polynesia) or any other island located in the Pacific Ocean.

Melanesians include the Fijians (Fiji), Kanaks (New Caledonia), Ni-Vanuatu (Vanuatu), Papua New Guineans (Papua New Guinea), Solomon Islanders (Solomon Islands), West Papuans (Indonesia's West Papua) and Moluccans (Indonesia's Maluku Islands).

Micronesians include the Carolinians (Caroline Islands), Chamorros (Guam and Northern Mariana Islands), Chuukese (Chuuk), I-Kiribati (Kiribati), Kosraeans (Kosrae), Marshallese (Marshall Islands), Nauruans [Nauru] Palauans (Palau), Pohnpeians (Pohnpei), and Yapese (Yap).

Polynesians include the New Zealand Māori (New Zealand), Native Hawaiians (Hawaii), Rapa Nui (Easter Island), Samoans (Samoa and American Samoa), Tahitians (Tahiti), Tokelauans (Tokelau), Niueans (Niue), Cook Islands Māori (Cook Islands), Tongans (Tonga), Wallisians, and Futunans (Wallis and Futuna). The term Pasifika was first used in New Zealand to designate the non-indigenous ethnic groups arriving from the aforementioned Pacific nations, excluding New Zealand itself; this term, when used in New Zealand, does not encompass the indigenous Māori people.

Auckland in New Zealand has the world's largest concentration of urban Pacific Islanders living outside of their own countries, and is sometimes referred to as the "Polynesian capital of the world." This came as result of a steady stream of immigration from Polynesian countries such as Samoa, Tonga, the Cook Islands, Niue, and French Polynesia in the 20th and 21st centuries.

The umbrella terms Pacific Islands and Pacific Islanders may also take on several other meanings. At times, the term Pacific Islands only refers to islands within the cultural regions of Polynesia, Melanesia and Micronesia, and to tropical islands with oceanic geology in general, such as Clipperton Island. In some common uses, the term refers to the islands of the Pacific Ocean once colonized by the Portuguese, Spaniards, Dutch, British, French, Germans, Americans, Japanese, and Chinese. In other uses, it may refer to areas with Austronesian linguistic heritage like Taiwan, Indonesia, Micronesia, Polynesia and the Myanmar islands, which found their genesis in the Neolithic cultures of the island of Taiwan. In an often geopolitical context, the term has been extended even further to include the continent of Australia.

In the North Pacific, non-tropical islands in and around Alaska, Japan, and Russia were inhabited by people related to Indigenous American and Far East Asian groups, with some Japanese ethnic groups also being theorized to be related to Indigenous Pacific groups. In the South Pacific, the easternmost oceanic island with any human inhabitation was Easter Island, settled by the Polynesian Rapa Nui people. Oceanic islands beyond that which neighbor Central America and South America (Galápagos, Revillagigedo, Juan Fernández Islands etc.) are among the last inhabitable places on earth to have been discovered by humans. All of these islands (excluding Clipperton) were annexed by Latin American nations a few hundred years after their discoveries, and initially were sometimes used as prisons for convicts. Today only a small number of them are inhabited, mainly by Spanish-speaking mainlanders of mestizo or White Latin American origin. These individuals are not considered Pacific Islanders under the standard ethnically based definition. In a broad sense, they could still possibly be seen as encompassing a small Spanish-speaking segment of Oceania, along with the Easter Island inhabitants, who were eventually colonized by Chileans. The 1996 book Atlas of Languages of Intercultural Communication in the Pacific, Asia, and the Americas notes that Spanish was once commonly spoken in the Pacific on the colonial-era Philippines, further stating, "at the present time, the Spanish language is not widely used in the South Pacific, being unknown outside of a handful of places. Spanish is spoken by a resident population only on the Ecuadorian Galápagos Islands, the Chilean possessions of Rapa Nui (Easter Island), Juan Fernández Islands and a few other tiny islands. Most Pacific insular possessions of Latin American nations are either unpopulated or used as military outposts, staffed by natives of the mainland."

Lord Howe Island, located between Australia and New Zealand, is one of the only other habitable oceanic islands to have had no contact with humans prior to European discovery. The island is currently administered by Australia, and Its residents are primarily European Australians who originated from the mainland, with a small number also being Asian Australians. Like with the Spanish-speaking islanders in the southeastern Pacific, they would not normally be considered Pacific Islanders under an ethnically based definition. Remote and uninhabitable islands in the central Pacific such as Baker Island were also generally isolated from humans prior to European discovery. However, Pacific Islanders are believed to have possibly visited some of these locations, including Wake Island. In the case of Howland Island, there may have even been a brief attempt at settlement.