Police are appealing for sightings or information about Brett Michael Healy, who was last seen north of Auckland last week.
The 34-year-old's last known location was in Whenuapai on Tuesday.
"Brett's disappearance is out of character and his family and police are concerned about his welfare," a police spokesperson said.
"He drives a 2009 silver Mazda 6 - registration GWW270."