Nearly half of Auckland's bus routes won't be operating tomorrow between 9.30am and 2pm.
Auckland Transport says the disruption is over a union meeting.
It says the bus services run by NZ Bus, which includes most services in the central city and a few out east, west and on the North Shore, will be out.
Auckland Transport says trains will have extra capacity during the day and independent drivers will operate the Inner Link service and some key routes.
Peak time services and school services will run as usual.
Ferries, trains and bus services run by other operators are not affected by the disruption.
A full list of the affected routes is available on the Auckland Transport website.