It follows two earlier deaths on North Island roads since the holiday weekend started on Friday.
A person died in a car crash in the Lower Hutt suburb of Taitā.
Police said they were called to the single-car smash at about 11am on Saturday.
Another person died in a crash in Waikato. Police said the crash occurred on Horotiu Rd, off State Highway 39 at about 11am on Saturday.
Last year's Labour Weekend holiday road toll was eight.
New Zealand is tracking towards having one of the highest road death tolls in more than a decade with 296 deaths as of October 20.
The toll is similar to October 2018's tally, with 2018 and 2017 the worst years since 2009.