A St John Ambulance spokesperson said three helicopters, three ambulances and two managers went to the scene on Ohui Rd at 11.27am.
Kathy Le Haavre and Tony Brooks, who has worked on a rescue helicopter and is a former surf lifesaver, were both on the beach when they spotted a man being dragged out to sea.
Le Haavre, a nurse, spent half an hour giving the man CPR before paramedics arrived on the scene but he was later confirmed to have died.
At least one person is reported to be in a critical condition, police said in a statement.
The Phillips Rescue Trust confirmed their Aerocool Rescue Helicopter was at the scene and an Auckland Westpac Rescue Helicopter spokesperson said two aircraft had been tasked to a water-related incident involving multiple people in the water.
Surf Lifesaving NZ have been approached for comment.
Opoutere Beach is about 20km north of Whangamatā, on the eastern seaboard of Coromandel Peninsula.
Today’s emergency comes less than 24 hours after a man went missing in the water in Whangamatā on Tuesday.
A police spokesperson said emergency services responded to a report of a man missing near the estuary, shortly after 6pm.