The term Polynesia refers to a cultural and geographical area in the Pacific Ocean, bound by what is commonly referred to as the Polynesian Triangle, which consists of Hawai'i in the north, New Zealand in the southwest, and Easter Island in the southeast. Thousands of islands are scattered throughout this area, most of which are currently included in one of the modern island states of American Samoa, Cook Islands, French Polynesia, Hawai'i, New Zealand, Samoa, Tonga, Tokelau, Tuvalu, and Wallis and Futuna.

The third edition of the Historical Dictionary of Polynesia greatly expands on the previous editions through a chronology, an introductory essay, an expansive bibliography, and over 400 cross-referenced dictionary entries on significant persons, events, places, organizations, and other aspects of Polynesian history from the earliest times to the present. Appendixes of the major islands and atolls within Polynesia, the rulers and administrators of the 13 major island states, and basic demographic information of those states are also included.