One person is feared dead in a boat fire on Waiheke Island.

A Fire Service spokesman said staff were called to a boat parked in a boat club on Causeway Rd in Ostend about 9.30pm.

It was well-involved in fire, he said.

"One person was injured with moderate injuries and taken to hospital. A second person is missing," he said.

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While staff are trying to establish what happened to the second person, there are concerns they may have died, the spokesman said.

The first person was flown to hospital by the Westpac Rescue Helicopter.