InternetNZ chief executive Vikram Kumar has announced his resignation.
A replacement is yet to be named, and the organisation says it will begin a search for his replacement immediately.
"Vikram has been responsible for making InternetNZ the go-to organisation for authoritative information about the internet in New Zealand," says president Frank March.
"In addition to increasing the visibility and reach of the organisation through initiatives such as NetHui, he has built a strong team which will serve the organisation well in the future.
"He has also cemented excellent relationships with government and NGOs, as well as contributed to partnerships that have enabled a wide range of public good initiatives, such as NetSafe, the 2020 Communications Trust, and the rebuilding of Christchurch's IT infrastructure.
"All of this was done while InternetNZ membership has doubled in the last three years."
InternetNZ looks after the .nz domain name space.