Haydon Kilmartin (born 22 July 1973) is a former Australian rules footballer who played with Hawthorn in the Australian Football League (AFL).

After playing in a premiership team at North Hobart in 1991, Kilmartin was picked up by Melbourne in the 1991 National Draft, with pick 31.^[1][2] He never played a senior AFL game for Melbourne and spent the next stage of his career in Western Australia, where he played for East Fremantle.^[3] In 1997 he finished second in the Sandover Medal and took part in the Westar Rules Grand Final loss to South Fremantle.^[4] On the back of his performances that year, he was selected by Hawthorn in the 1998 pre-season draft and made 10 appearances in the 1998 AFL season, mostly off the bench.^[5][6]