The event comes between other big events including the sailing of the America's Cup early in the year, the World Softball Championships and Apec leaders' week in November.
"I also want to acknowledge the passionate support we received from Newcastle and the Hunter Valley Rugby communities behind our bid".
"I know there will be thousands of supporters excited to go back to New Zealand". I definitely don't think [the women's XVs World Cup] is the be-all and end-all. "To be able to announce this news across all three competitions, three years before their respective World Cup Finals, demonstrates further progress for the worldwide game and we look forward to ongoing collaboration with the RLWC2021 organisers".
New Zealand Rugby (NZR) revealed the match venues for the tournament on Wednesday, with Wellington set to welcome the Springboks, while Eden Park in Auckland will host the Kiwi's Bledisloe Cup encounter against the Wallabies.
"Securing the Women's Rugby World Cup, against strong competition from Australia, shows the growing status and recognition of worldwide women's sporting events", he says.
"I think even though World Rugby made a recommendation for the men's World Cup last time and it wasn't followed, I still think it would be good process for World Rugby to make a recommendation based on their bid analysis".
"Securing the Women's Rugby World Cup, against strong competition from Australia, shows the growing status and recognition of worldwide women's sporting events", he said.
Matches will be staged in Auckland and Whangarei - Waitakere Stadium, the Northland Events Centre and Albany - from July to August, with the final and, possibly, semifinals to be played at Eden Park.
"Delighted to congratulate the New Zealand Union on hosting the Women's Rugby World Cup in 2021", World Rugby Chairman Bill Beaumont told reporters.
"You listen to the presentation and it was the passion, the passion for the sport".
The RFL has looked to breathe new life into the Challenge Cup final date by adding the 1895 Cup to give a bumper new-look programme of three matches.
"I'm really looking forward to her seeing the best of these female rugby players on our home turf that's why drives me now". That came out in the bid.
The revised structure comes a year after Ireland were robbed of a finals berth despite claiming more victories than the winless Samoa and host nation New Zealand, who were both were eliminated in the quarterfinals.