Director-General of Health Ashley Bloomfield is stepping down from his role at the end of July.

Public Service Commissioner Peter Hughes revealed Dr Bloomfield's decision in a statement this morning.

Bloomfield had signalled to the commissioner late last year he intended to step down before his term officially ended on 11 June 2023, Hughes said.

He said Bloomfield had done an outstanding job leading the government's health response to Covid-19 and the vaccination rollout.

"Dr Bloomfield has worked tirelessly for more than two years to keep New Zealanders safe from coronavirus," Hughes said.

"Dr Bloomfield has demonstrated remarkable resilience and courage in leading the health system's overall response to Covid-19. That response has saved lives.

"I thank Dr Bloomfield for his commitment to public service, his spirit of service to the community and his exceptional contribution to New Zealand's Covid-19 response. I know many New Zealanders will also be thankful for the job he has done."

Hughes said Bloomfield wanted to stay on until the country had a good hold on the virus, and that time was now.

In a post on Facebook, Prime Minister Jacinda Ardern said Bloomfield had been a true public servant in every sense, through his dedication, drive and calmness.

"He has been central to our COVID success as a nation, and he's done it with humour and grace (I'll keep the details of his sporadic mockery of me to myself!)

"When we spoke about his decision to move on, he mentioned that he wanted to spend time with his family, and that's the least we owe him. So kia ora from across the Motu, Dr Bloomfield. We thank you."

Covid-19 Response Minister Chris Hipkins also posted on Facebook after the news was released, acknowledged Bloomfield for being a "reassuring figure" through the pandemic response.

"The amount of pressure he's absorbed, and the level of commitment he's shown over the past two years make that an easy decision to understand.

"We thank you Ashley for all you've done to keep us all safe. Give the man a beer, he's truly earned it!"

An acting director-general will be appointed before Bloomfield finishes on July 29, 2022.