Earlier this morning Fire and Emergency NZ was called to a crash on Grand Drive in Orewa, north Auckland about 10.13am.
One woman was found trapped in the crash but has now died.
Two others have been taken to hospital as a precaution.
Cordons were in place on Grand Drive and motorists were advised to avoid the
area.
The road was expected to be closed for at least another hour.
The Serious Crash Unit was in attendance, police said. They were in the process of notifying the woman's next of kin.
The NZ Transport Agency said access to Grand Dr from State Highway was blocked.
Northbound SH1 traffic should use the Millwater (Wainui Rd) exit, while southbound SH1 traffic should continue south to Silverdale (Hibiscus Coast Hwy) exit to get to Orewa.
St John said three ambulances were sent to the scene. Two patients with moderate injuries had been treated.