Jack Rayner (born 19 December 1995) is an Australian long-distance runner. In 2015 he won the Australian national championships in the 3000m. In 2018 he won the half marathon national championships in the Sunshine Coast. Later on in 2018, Jack won the inaugural half marathon Commonwealth championships in Cardiff in a time of 1:01:01. In October 2019 he was one of forty-one pacemakers in the Ineos 1:59 Challenge, where Eliud Kipchoge successfully became the first person to run the marathon distance in under 2 hours. Rayner is part of the Melbourne Track Club.