A St John spokeswoman said they had been called to Te Kura Kaupapa Maori o Tokomaru at 11.07 this morning.
Stuff is reporting that a 12-year-old boy has died of a suspected cardiac arrest.
St John said two ambulances were sent, as well as a helicopter. Fire and Emergency NZ also attended.
A woman at the school said the family were at the school grieving and she did not wish to comment.
A police spokeswoman said it attended Te Kura o Tokomaru, at the request of ambulance, shortly after 11.30am where a pupil had sadly died.
Initial inquiries were being made.
In its last ERO report in January, the school had a roll of 30 pupils.
Tokomaru Bay is a small beachside community located on the East Coast, 91km north of Gisborne.