47-year-old Langer replaced Darren Lehmann, who resigned after the Test series in South Africa earlier this year which was marred by a ball-tampering scandal.
Former cricketer Justin Langer has been named as Australia's new head coach on a four-year contract, Cricket Australia announced on Thursday.
"Langer will coach Australia in all three formats of the game and will commence in the role on May 22, for a four-year term taking in two Ashes Series, a World Cup and World T20 tournament," Cricket Australia said in a statement.
The former opening batsman replaced Darren Lehmann, who resigned after the Test series in South Africa earlier this year which was marred by a ball-tampering scandal.
While an inquiry by Cricket Australia found no involvement of Lehmann in the ball-tampering incident in the third test in Cape Town, Australia captain Steve Smith and vice-captain David Warner were banned from international cricket for a year.
47-year-old Langer played in 105 test matches and scored more than 7,500 runs, including 23 centuries. He made his Test debut in 1993, and played final Test in 2007.
His career spanned almost 20 years, in which he played 360 first-class matches in which he scored more than 28,000 runs.
“We are thrilled to appoint Justin as Bupa Support Team Head Coach of the Australian Men’s Cricket Team,” Cricket Australia CEO, James Sutherland, said.
“Whilst Darren Lehmann was not due to complete his term until next year, we have had a succession plan in place for this role for some time," he said.
“Justin’s work ethic, leadership and values are among his strongest attributes – and he is widely respected across the global cricket community," Sutherland said.
Speaking on his appointment, Langer said," I am very excited about the scope I now have to coach the country that supported me so much in my cricketing career. There will be some significant challenges ahead for our group, but there is a wealth of talent in Australian cricket that I know will do us all proud."
“I’m thoroughly looking forward to working with all players, as we strive for a successful men’s team across all formats, with the support and respect of the Australian public,” Langer said.
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 "Justin Langer speaks to the media in Melbourne, after being appointed new Australia head coach")
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