Sir Henry Hamilton Johnston (12 June 1858 - 31 July 1927), known as Harry Johnston, was a British explorer, botanist, artist, colonial administrator, and linguist who travelled widely in Africa and spoke many African languages.

His book Pioneers in Australasia tells the story and colonization of a land called Australasia- a region which comprises Australia, New Zealand, and some neighbouring islands. It discusses the general features of Australasia, its first human inhabitants, the Spanish and Portuguese explorers to the Pacific Ocean, the Dutch discoveries, Dampier's voyages, James Cook's voyage's, and the results of the pioneers' work.