David Cunliffe has won the Labour leadership narrowly with 51.15 percent of the total vote.
Supporters at Mr Cunliffe's small New Lynn electorate office have erupted into applause as the result was announced.
Speaking to his supporters, Mr Cunliffe said today was a new beginning for Labour and New Zealand.
Maiki Sherman with more on this report, tonight 5:30pm on Te Kāea.