Kara Mason is standing down as principal of Masterton Intermediate School.
Ms Mason started as principal at the school in October 2011, replacing Frazer Mailman, who had been in the role for 21 years.
Mark Brown, MIS Board of Trustees chairman, said the search had begun for a replacement for Ms Mason, who had been an exemplary principal.
Ms Mason had previously spent eight years teaching at Roslyn School in Palmerston North, where she had risen to the position of deputy principal before shifting to Masterton.
Mr Brown said Ms Mason had tendered her resignation at the monthly board meeting in February and the board had met Monday night and begun the procedure that will lead to the appointment of her replacement at the decile 5 school.