Port of Tauranga chairman David Pilkington is to retire in July.
He has been nine years in the role and nearly 17 years on the board of the NZX-listed company, which operates New Zealand's biggest port.
Pilkington will be succeeded by Julia Hoare, who joined the board in 2015 and chairs its audit committee.
Pilkington said he was "incredibly proud" of the legacy the port company has built.
"I have been fortunate to work with a highly skilled management team and fellow directors, who have been open in sharing their diverse points of view. As a team, we have stayed focused on our long-term goals, while remaining flexible and responsive to the challenging environment in which we operate."