Head coach Allan Bunting during the warm-up before the bronze final match between New Zealand and France in September. Photo: Action Images via Reuters/Andrew Boyers
The six-times world champions were knocked out of the semi-finals by Canada in a major shock in England, their earliest exit since the 2014 tournament in France.
The Kiwis went on to beat France 42-26 in the bronze medal match in September.
New Zealand Rugby said Bunting had declined to reapply for the position and would now seek a replacement.
Bunting said he looked forward to new opportunities in high performance sport.
"It’s been an absolute honour to lead the Black Ferns in this position," Bunting said in a New Zealand Rugby statement.
"To have played a role in the growth of the women's game during this time has been a privilege."
