Four other people were seriously injured in the two-vehicle crash.
A head-on collision just two hours later in Ōkaihau resulted in the death of Kahi Brown, 48, of Ōkaihau.
A post on a marae Facebook page described him as a "beloved brother, father, uncle and most loved bro to many".
Baden Brown, 64, of Auckland, was killed in the fourth crash of the week, on Saturday, June 25.
This was a single-vehicle motorcycle crash on State Highway 15/Mangakahia Rd, at Nukutawhiti.
"Police extend our deepest sympathy to all families and friends of the deceased," a police spokesperson said.
"Inquiries into the circumstances of the crashes are ongoing."
Northland road policing manager Inspector Anne-Marie Fitchett told the Advocate earlier this week speed was suspected in at least two of the crashes and no seatbelt was worn in another.
"We need to wear our seatbelts, we need to stick to the speed limits and drive to the conditions. If it's wet, slow down."
The deaths took Northland's 2022 road toll to 16, compared with 20 at the same stage of 2021.