Mitchell James Duncan (born 10 June 1991) is an Australian rules footballer for the Geelong Football Club in the Australian Football League (AFL).
A versatile player at 1.88 metres (6.2 ft) tall and weighing 87 kilograms (190 lb), Duncan is able to contribute in the forward line as well as the midfield.
A standout junior footballer, Duncan entered top-level football early by signing for East Perth Football Club in the WAFL at the age of sixteen years.
His accomplishments as a junior included winning a national championship with Western Australia, achieving All-Australian honours, selection for Australia in the International Rules Series, and being awarded an AIS-AFL Academy scholarship.
Following a decorated junior career, Duncan was selected with Geelong's second pick, and twenty-eighth overall, in the 2009 AFL Draft.
Duncan made his AFL debut in 2010, and was nominated at the conclusion of the season for the AFLPA Best First Year Player Award.