The announcement is a major shot in the arm for the Exiles who invested heavily in the state-of-the-art facility in the borough of Spelthorne.
The arrangement will see 2011 RWC semi-finalists Wales and Fiji use Hazelwood as a training facility in the lead up to and during the six-week tournament.
The two countries will also play some of their pool games at the venue in the knock-out stages of the tournament.
London Irish executive chairman, David Fitzgerald said: “We are delighted to be an official training venue for Rugby World Cup 2015 and to be working with England Rugby 2015.
“This is an exciting time for the club and for the local Spelthorne community. It is a great testament to our new facility that Hazelwood is a training venue fit for involvement in the biggest sporting event in 2015, and we look forward to welcoming Fiji and Wales next autumn.
“We would like to also extend our gratitude to the Xcel Leisure Complex for their support in this exciting bid.”
London Irish teamed up with Xcel Leisure Complex in Walton-on-Thames to submit a bid to England Rugby 2015, the organisers of the RWC 2015 which culminates in the final at Twickenham on October 31, 2015.
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