Toby Gillen (born 23 May 2001) is an Australian middle-distance runner.
Biography Originally from Cairns, as a teenager in 2017, he placed second in the Great Barrier Reef Marathon's 10km run.
Gillen left Australia to study in the United States in 2022. Competing for Saint Louis University and the University of Mississippi, Gillen reached the NCAA Outdoor Championships for three consecutive years between 2023 and 2025 over 5000 metres, winning All-American honours for the 5000 meters in 2024, as he finished in seventh place overall. In 2026, he joined On Athletics Club Oceania under Head Coach Craig Mottram.
Competing in the 5k run at the 2026 World Athletics Road Running Championships on 19 September 2026 in Copenhagen, he won the silver medal with the Australian team in the mixed event alongside Rose Davies, Georgia Griffith and Ky Robinson, running a personal best of 13:35 to place twenty-fifth in the individual race.
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