Eucalyptus calcareana, commonly known as the Nundroo mallee or Nundroo gum, is a mallee that is native to the south coast of Australia. The tree or occasionally mallee typically grows to a height of 3 to 10 metres (10 to 33 ft) and has smooth bark. It blooms on March or April and produces white flowers. It is found along the south coast of the Goldfields-Esperance region of Western Australia and the south coast of South Australia.