Labour MP Meka Whaitiri has been removed as a Minister after an investigation into an incident in her Gisborne office.

Prime Minister Jacinda Ardern said she no longer has confidence in Ms Whaitiri, after a report into the incident which involved Ms Whaitiri and a staff member on August 27.

"No one wants to lose ministers, but I have to make decisions based on the information in front of me," she said.

Ms Whaitiri has accepted the decision but continues to contest aspects of the report, which Ms Ardern said is not yet ready for public release.