Matthew James Giteau (born 29 September 1982) is an Australian rugby union player who now plays for the Japanese Top League side Suntory Sungoliath.
During his career he won 100 test caps for Australia.
He was reselected to the national team after several years' absence under rule known as Giteau's law.
Giteau is a utility back.
His usual positions are inside-centre and fly-half, although he started his career as a scrum-half.
He played for the Wallabies for the first time in 2002 against England at Twickenham and was a nominee for the International Rugby Board Player of the Year in 2004.