They were Terry Charleston, 34, and Rebecca McAlees, 24. Both are from Whitford, Auckland, police said.
The pair were initially reported to be in a critical condition after the single-vehicle crash on Clevedon-Kawakawa Rd, south of Auckland, about 7.30pm on Christmas night.
Police later confirmed they had died.
"Our thoughts are with their families and friends," a police statement said this morning.
Authorities are still working to figure out the circumstances of the crash.
Police said inquiries into the incident are ongoing.