Fonterra said a member of its management team, Maury Leyland, had resigned for personal reasons, effective from March 31.
Leyland is the co-operative's managing director of people, culture and safety.
Chief executive Theo Spierings, in a statement, thanked Leyland for her contribution and commitment to Fonterra over the past 11 years.
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"During this time Maury has been involved in some defining events for our Co-op," he said.