Earlier this year the board of the fund confirmed it had ordered an independent investigation after a complaint against one of its staff, conducted by employment lawyer Rob Towner.
The investigation did not uphold the complaint, chairman Murray Gribben later confirmed. He did not confirm who the staff member was.
Gribben has not yet responded to requests for comment on the departure.
Economic Development Minister Phil Twyford confirmed he had been informed of Dellabarca's resignation but declined to comment "as this is an employment matter".
Assuming Dellabarca is the highest paid staff member of NZ Growth Capital Partners, he was paid between $520,000 and $529,999 in 2019, according to the fund's annual report.
He currently sits on the boards of Kea NZ, the NZ Rugby Union, Harmoney and the Blues and is a member of the Institute of Directors New Zealand.
According to a profile on NZ Growth Capital Partner's website, Dellabarca had worked in venture capital and private equity in Europe, Asia and North America.