New Zealand's Ambassador to the United States Tim Groser himself asked to leave the position at the end of his three-year term, Foreign Affairs Minister Winston Peters has confirmed.

"Any suggestion he has been recalled by the minister or ministry is baseless," Peters said in a statement.

"The New Zealand Ambassador to the United States, Hon Tim Groser, is leaving his position later this year at the expiry of his three-year term.

"He was appointed by the previous government and his contract was only ever for three years.

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"Mr Groser himself asked to finish at the conclusion of his three-year term and did not seek any extension."

The Ministry of Foreign Affairs and Trade said the process to appoint a successor was under way and an announcement would be made in due course, as with all New Zealand heads of mission appointments.

The three-year posting can be extended, and previous ambassadors have done so.