Thallon is a town in south western Queensland, Australia. The town is located in the Balonne Shire Local Government Area, 571 kilometres west of the state capital, Brisbane. Thallon is situated between St George and the border with New South Wales at Mungindi. The town is named after a Queensland Commissioner for railways, J.F Thallon. At the 2006 census, Thallon and the surrounding area had a population of 292.

Explorer Thomas Mitchell was the first European in the Thallon district and his initials can still be found on a bloodwood tree near the Moonie River. In 1911, the area was set aside for closer settlement and 780 acres were gazetted as a town reserve. With the coming of the railway, the town developed and shops and a hotel were established. Thallon is now a major wheat and woolgrowing area.

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