Jill Harrison (née Clarke; born 20 June 1958) is an English long-distance runner.
She didn't discover running until encouraged in a PE lesson to train for the Sheffield schools championships.
Clarke represented England competing in the 10,000 metres at the 1986 Commonwealth Games in Edinburgh, Scotland, but dropped out due to injury.
Coaches have included George Gandy, Brian Scoby and Frank Horwill.
Training partners have included 1989 London Marathon winner Veronique Marot, 1984 Olympic silver medallist Wendy Sly, and Angie Pain.