Joshua and Parker have agreed to put their IBF, WBA Super, IBO and WBO belts and unbeaten records on the line, ending a period of intense negotiation between the rival camps.
The winner-takes all contest will put the winner within touching distance of becoming the first undisputed Heavyweight champion of the world since Lennox Lewis in 1999.
“I would like to announce the official news that myself and Joseph Parker will be fighting on March 31 at Principality Stadium in Cardiff,” said Joshua.
“It is a unification Heavyweight championship fight, we all know what happened last time I was in a unification Heavyweight championship fight, it was gruelling, it was interesting and we both left the ring with masses of respect.
“These fights aren’t easy because there is a lot on the line, so respect to team Parker for taking the challenge. And you know me, I love this game. I am looking forward to it, training camp is underway and before you know it March 31 will be upon us. Stay tuned for more news and I will see you all soon, God bless.”
WBO champion Joseph Parker said he was relieved the contractual negotiations had now been concluded as he could now fully concentrate on the job in hand.
“Anthony Joshua is in for a huge shock,” Parker said. “A couple of months ago I heard him say ‘why should I be worried about this little kid from New Zealand’?
“Well, now he’s about to find out. And the world is about to find out whether AJ can really take a punch. My entire existence is now devoted to proving what the boxing world already knows.”
Joshua returns to the scene of his last action in the ring, where Carlos Takam became his 20th win inside the distance from his 20 pro fights, the fourth defence of his IBF crown and first of the WBA Super and IBO belts he landed in his epic battle with Wladimir Klitschko at Wembley Stadium last April.
“I’m delighted to get this fight made – it’s been a long time coming,” said Joshua’s promoter Eddie Hearn. “Champions should fight Champions and AJ continues to step up to the challenges.
“It’s the first time in history that two reigning heavyweight World champions have met in Britain and it’s a classic match-up between two young, fast, undefeated belt holders and it’s going to be an explosive fight. This is another huge unification fight for Anthony as he continues to make history in the quest to become undisputed World heavyweight champion.”
Parker’s last fight was his first in England as he defended his WBO strap for the second time, outpointing Hughie Fury in Manchester in September, moving to 24-0 with the win. The 26-year-old became New Zealand’s first heavyweight world champion when he landed the WBO strap in December 2016 against the undefeated Mexican American star Andy Ruiz in Auckland.
He comfortably defended the crown for the first time against giant Romanian Razvan Cojanu in May.
An announcement on on-sale dates, ticket prices and travel packages will be made soon.