Jack Hassen (25 January 1924 – 8 December 2002) was an Australian Aboriginal boxer, and won the Australian Lightweight Championship in 1949.
In various historical sources Hassen was also known as Jack Friday, but in 2011 his family asserted that he never identified as Jack Friday and that Friday was actually a corruption of his father's first name, Friday Mackay.
He was inducted into the Australian National Boxing Hall of Fame in 2005.