Mountain ash may refer to: * ''

Eucalyptus regnans ''Eucalyptus regnans'', known variously as mountain ash (in Victoria), giant ash or swamp gum (in Tasmania), or stringy gum, is a species of very tall forest tree that is native to the Australia states of Tasmania and Victoria. It is a straigh ...

'', the tallest of all flowering plants, native to Australia * Mountain-ashes or rowans, varieties of trees and shrubs in the genus ''Sorbus''

See also