Martin James Kelly (born 20 February 1973 in Warburton, Victoria) is an Australian judoka, who competed in the men's half-heavyweight category.
He held six Australian titles in his own division, picked up a total of nineteen medals in his career, including a bronze from the 2002 Commonwealth Games in Manchester, England, and represented his nation Australia at the 2004 Summer Olympics.
Kelly opened his match with a brilliant ippon victory and an uki waza (floating drop) over Barbados' Barry Kirk Jackman, before he was easily beaten by his next opponent and reigning Olympic champion Kosei Inoue of Japan, who threw him down the tatami with uchi mata (inner thigh throw) at one minute and twenty-four seconds.