Vahitahi, or Vaitake, is an atoll in the eastern area of the Tuamotu Archipelago, French Polynesia. Vahitahi's nearest neighbour is Akiaki, which is located to the northwest.
Vahitahi is a small atoll with an elongated oval shape. It measures approximately in length and has a maximum width of . Its reef encloses completely the lagoon. The total land area of the islands on its reef is .
The main village is called Mohitu (formerly Temanufaara). There were 105 inhabitants according to the 2012 census. Vahitahi is the least populous atoll in French Polynesia to see a regular air service.
Vahitahi Atoll was the first land that Louis Antoine de Bougainville found in the Pacific in 1768. He called the atoll Les Quatre Facardins, after a novel of the time. James Cook reached Vahitahi the following year and named it Lagoon Island.
Vahitahi has a territorial airport. It was inaugurated in 1986.
Administratively Vahitahi Atoll belongs to the commune of Nukutavake.