Moira Coatsworth has resigned as president of the Labour Party, little more than a week after Andrew Little was elected its new leader.
Ms Coastworth is standing down next month after three-and-a-half years in the post.
She said now was the right time to leave, following the appointment of new leader Andrew Little on 18 November.
"Parliament has a three-year term. I told the conference last year this would be my term but when is the right time in that term?
"I want to see a new president working with Andrew as the new leader, really hitting the ground running at the beginning of next year and getting a plan in and getting moving."
Ms Coatsworth said nominations would be called for in mid-December, and a vote held in February.