Graham James Arnold is an Australian soccer manager and former player. Arnold was first appointed to work as a head coach of the Australian national soccer team in 2000. After head coach Frank Farina was sacked in 2005, Arnold worked with Guus Hiddink for the 2006 FIFA World Cup campaign, in which they made the second round of the finals. After Hiddink left, he became interim coach of the Socceroos. Arnold went on to qualify Australia's U23 men's national soccer team for the 2008 Beijing Olympics. Arnold then went on to assist Pim Verbeek for qualification of the 2010 World Cup in South Africa. Arnold's next move was to take the manager role at struggling A-League club the Central Coast Mariners between 2010 and 2013, where he guided the club to a Premiership and a Championship. He is a member of the Football Federation Australia Football Hall of Fame. Arnold went on to win two Premierships, one Championship and an FFA Cup with Sydney FC. In August 2018, Arnold was appointed head coach of the Socceroos - Australia's senior men's national soccer team.