Matthew Lawrence Hayden AM (Member of the Order of Australia) (born 29 October 1971 in Kingaroy, Queensland) is a former Australian cricketer, currently signed on for the Chennai Super Kings in the IPL (Indian Premier League). Hayden is a powerful and aggressive left-handed opening batsman (batting order (cricket)#opening batsman), known for his ability to score quickly at both Test (Test cricket) and one day (one-day cricket) levels.

Hayden currently holds the record for the highest scores made by an Australian batsman in both the Test (380) and One Day International (181 not out) arenas. He formed one of the most prolific opening partnerships in world Test cricket for Australia (Australian cricket team) with Justin Langer, and in ODI cricket with Adam Gilchrist. Upon his retirement, in January 2009, Haydens Test average was 50.7; he had scored the second most runs in Test Cricket by an opening batsman; and was equal 6th (with Jacques Kallis) on the all-time list for Test centuries.