Helidon is a rural town and locality in the Lockyer Valley Region, Queensland, Australia. In the 2021 census, the locality of Helidon had a population of 1,130 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.

Helidon is also the location of a natural mineral spring whose products were sold by the Helidon Spa Water Company, now known as Kirks.

Helidon is located on the Warrego Highway, 106 kilometres (66 mi) west of the state capital, Brisbane, and 21 kilometres (13 mi) east of Toowoomba.

Parts of the hilly, undeveloped north of Helidon have been protected within Lockyer National Park.

The Helidon district is called by Aboriginal inhabitants "Yabarba", the name of the Curriejung, and the nearby spring is known as "Woonar-rajimmi", the place "where the clouds fell down!"

The name Helidon derives from a pastoral run name established in 1841 by Richard Jones (1786–1852), a merchant and pastoralist.

William Turner paid 60 pounds rent for the Hellidon Run of 25,600 acres, in 1853. He was later (1861), appointed magistrate for the district.