Joel Monaghan (born 22 April 1982 in Canberra, ACT) is an Australian professional rugby league footballer for the Canberra Raiders of the NRL. An Australian international and New South Wales State of Origin representative three-quarter, he also previously played club football with the Sydney Roosters for 3 years before returning to the Canberra Raiders. He is the younger brother of fellow rugby league player Michael Monaghan.
Monaghan's junior development was influenced National Rugby League coach Neil Henry who was Monaghan's coach at Erindale College. While attending Erindale College, Monoghan played for the Australian Schoolboys team in 2000.
Monaghan made his NRL debut in 2001 for Canberra against the Penrith Panthers in round 10 and spent four seasons with the club.
He debuted for the Sydney Roosters in round 2005, against the South Sydney Rabbitohs. He missed much of the 2006 season after injuring his knee in a trail match against the St George Dragons then suffering later hamstring injuries during the year. He had a successful 2007 season at the Roosters scoring 13 tries in 17 games.
In 2008, Monaghan returned to the Canberra Raiders for the 2008 season. He won the Mal Meninga Medal for the club's Player of the Year.
After the end of the 2010 season, Monaghan apologised for "a moment of abject stupidity" after a photograph of him simulating a lewd act with a dog was published on Twitter. The photograph was noted and discussed by media outlets around the world.
In August 2008, Monaghan was named in the preliminary 46-man Kangaroos squad for the 2008 Rugby League World Cup, and in October 2008 he was selected in the final 24-man Australia squad.He made his test debut on the wing for Australia's opening game of the RLWC against New Zealand at the Sydney Football Stadium on Sunday, 26 October 2008. In the final, he made the mistake of tackling Lance Hohaia who was without the ball, which resulted in a penalty try, changing a two-point deficit to an 8-point deficit with only 10 minutes left