Tahiti (English: ; Tahitian [taˈhiti]; French pronunciation: ​[ta.i.ti]; previously also known as Otaheite) is the largest island of the Windward group of the Society Islands in French Polynesia. It is located in the central part of the Pacific Ocean and the nearest major landmass is Australia. Divided into two parts, Tahiti Nui (bigger, northwestern part) and Tahiti Iti (smaller, southeastern part), the island was formed from volcanic activity; it is high and mountainous with surrounding coral reefs. Its population was 189,517 in 2017, making it by far the most populous island in French Polynesia and accounting for 68.7% of its total population.

Tahiti is the economic, cultural and political centre of French Polynesia, an overseas collectivity and an overseas country of the French Republic. The capital of French Polynesia, Papeʻete, is located on the northwest coast of Tahiti. The only international airport in the region, Faʻaʻā International Airport, is on Tahiti near Papeʻete. Tahiti was originally settled by Polynesians between 300 and 800 CE. They represent about 70% of the island's population, with the rest made up of Europeans, Chinese and those of mixed heritage. The island was part of the Kingdom of Tahiti until its annexation by France in 1880, when it was proclaimed a colony of France, and the inhabitants became French citizens. French is the sole official language, although the Tahitian language (Reo Tahiti) is also widely spoken.