It will bring a 13-year tenure as Wales coach to an end for the former Wales hooker.
McBryde played 37 times for Wales, retiring from the game in 2005.
He went straight into coaching after hanging up his boots and was named Wales forward coach in 2006 under Gareth Jenkins. He continued in the role when Warren Gatland come on board in 2008 and has been part of a coaching team that has delivered three Six Nations Grand Slam and a Six Nations title.
McBryde led Wales on three separate occasion as head coach, for the 2009 tour to USA & Canada, to Japan in 2013 and a two test tour to the Pacific in 2017.
He will link up with Leinster post the RWC later this year.
Commenting on the announcement, McBryde said:
“I am delighted to be joining Leinster. They are one of the standout teams in Europe, with a strong identity and a proud history, and I am really looking forward to starting with them later this year.
I see it as a great opportunity to join a very experienced and exciting coaching team and to help continue Leinster’s great successes.
They are a world renowned team, with passionate supporters and I am looking forward to working with the squad and the coaches.
I’m hugely proud of my time with Wales, and it has been an honour to coach my country.
I have never taken it for granted and it has been a hugely rewarding experience to have been part of the coaching team under Warren Gatland and the success we have had over the years.
I am thrilled to have secured my future with Leinster post RWC, and it now allows me to focus all my energy on the task at hand with Wales.”
