French, Tahitian, other French Polynesian dialects, and some English. Tahitian and the other distinct French Polynesian dialects, such as those spoken in the Tuamotu islands, are closely related to all other dialects throughout the Polynesian Triangle. For example, a Tahitian chief is an ari'i, while a Samoan or a Hawaiian chief is an ali'i. A Tahitian house is a fare [pronounce both syllables] while a New Zealand Maori house is a whare (which is pronounced the same as its Tahitian counterpart).
Like many Polynesian dialects, reduplicated words - such as Bora Bora - are common; and often have the effect of intensifying the meaning of a single occurrence: For example, nui may mean 'big' while nuinui means 'very big.'
While Tahitian is still widely spoken throughout French Polynesia, many young people today communicate almost exclusively in French.