Waiheke Island (/waɪˈhɛkiː/; Māori: [ˈwaihɛkɛ]) is in the Hauraki Gulf of New Zealand, about 17.7 km (11.0 mi) from Auckland.

It is the second-largest island in the gulf, after Great Barrier Island. It is the most populated, with nearly 8,730 permanent residents plus another estimated 3,400 who have second or holiday homes on the island. It is New Zealand's most densely populated island, with 93 people/km², and the third most populated after the North and South Islands. It is the most accessible island in the Gulf, with regular passenger and car ferry services, a Waiheke-based helicopter operator, and other air links. In November 2015, Waiheke Island received international attention when it was rated the fifth best destination in the world to visit in 2016 by Lonely Planet and also voted the fourth best island in the world in the Condé Nast Best Islands in the World List