Helidon is a rural town and locality in the Lockyer Valley Region, Queensland, Australia. In the 2016 census, the locality of Helidon had a population of 1,059 people. Helidon is known in Queensland for its high quality sandstone (also called freestone), used extensively in private and public buildings in the state and elsewhere, including Brisbane City Hall, Brisbane Treasury Building, University of Queensland, and sought after internationally for its quality, especially in China.