Bus drivers from eight Auckland depots are taking part in industrial action between the 17th and the 27th this month, which could affect transport services.
First Union announced in a statement that the union is pushing for "fairer pay and work conditions" including the retention of overtime rates and new employee contracts.
"Bus driver's pay packs have borne the brunt of a council tendering process installed by the previous government that incentivises bus companies to cut wages in order to offer the cheapest tender to council contracts for bus routes," First Union organiser Graham McKean said.
"Companies are struggling to get bus drivers and as a consequence of supply and demand need to pay employees significantly more to attract and retain drivers."
Early-morning strikes will take place at the Swanson, Mt Roskill, Onehunga, Orewa, North Shore, Wiri, City and Panmure depots on April 17, 18, 19, 20, 23, 24, 26, and 27th, respectively.