Redcastle is a locality in the City of Greater Bendigo and the Shire of Campaspe, Victoria, Australia. At the 2021 census, Redcastle has a population of 67.

Redcastle was established in 1859 following the discovery of gold in the area and was originally known as the Balmoral Diggings. Located between the McIvor (Heathcote) and Waranga (Rushworth) goldfields, it was an isolated mining site. The name "Redcastle," of Scottish origin, later replaced Balmoral, though the reason for the change remains unknown. Redcastle was a mining town until the 1880s when the population started to decrease. Many abandoned gold mines can still be found in the area.