Justin Lee Langer is an Australian cricket coach and former cricketer. He is the former coach of the Australia men's national team, having been appointed to the role in May 2018 and leaving in February 2022 and became the coach of Lucknow based IPL franchise Lucknow Super Giants in July, 2023. A left-handed batsman, Langer is best known for his partnership with Matthew Hayden as Australia's test opening batsmen during the early and mid-2000s, considered one of the most successful ever. Representing Western Australia domestically, Langer played English county cricket for Middlesex and also Somerset. He holds the record for the most runs scored at first-class level by an Australian. As Australia's coach, he led the team to victory in the 2021 T20 World Cup.

The Australia men's national cricket team represents Australia in men's international cricket. As the joint oldest team in Test cricket history, playing in the first ever Test match in 1877, the team also plays One-Day International (ODI) and Twenty20 International (T20I) cricket, participating in both the first ODI, against England in the 1970–71 season and the first T20I, against New Zealand in the 2004–05 season, winning both games. The team draws its players from teams playing in the Australian domestic competitions – the Sheffield Shield, the Australian domestic limited-overs cricket tournament and the Big Bash League. Australia are the current ICC World Test Championship and ICC Cricket World Cup champions. They are regarded as most successful cricket teams in the history of Cricket.