A pilot and 11 passengers have been injured when a helicopter coming in to land in a New Zealand national park crashed into another chopper.

It appears a helicopter clipped a stationary craft on its descent to land near Tyndall Glacier, near the head of the Shotover River, in Mt Aspiring National Park, Rescue Co-ordination Centre New Zealand's Kevin Banaghan says.

A Mayday call was made around 3.20pm (1320 AEDT) on Monday and RCCNZ received an alert from one of the helicopters' emergency locator transmitters.

Four rescue helicopters worked to retrieve the injured pilot and several passengers from the landing helicopter.

Eleven passengers with various minor injuries were taken to Queenstown Airport.

The injured pilot was also taken to Queenstown and will be transferred to Dunedin Hospital on Monday evening.

Mr Banaghan said the extent of the pilot's injuries was unknown at this stage.