Pāuanui Beach is closed this afternoon and swimmers ordered out of the water after up to three sharks were sighted.
Surf lifesavers requested everyone - estimated to be nearly 500 people - to stay on shore at 1pm. The beach was still closed at 3.30pm.
The beach was reopened several hours later.
A lifeguard said a shark had been spotted by those patrolling the popular Coromandel beach.
A surf lifesaving spokeswoman, Mackenzie Koppel, said as many as three sharks had been spotted in water near where people were swimming at the beach.