John Grattan (1800,Dublin −1871) was anIrishnaturalist andanthropologist.

John Grattan was an apothecary in Belfast. He had wide interests innatural history and was a member of theBelfast Natural History Society but is best known for his work on ancient Irish skulls collected by his friendEdmund Getty. He devised asystem of skull measurements using an ingenious craniometer. "Grattan's work was almost contemporaneous with that ofAnders Retzius, and nearly all of it was done before the German and French Schools had elaborated their schemes of skull measurements."^[1]

• On the Importance, to the Archæologist and Ethnologist, of an Accurate Mode of Measuring Human Crania, and of Recording the Results; With the Description of a New CraniometerThe Ulster Journal of Archæology
• Notice of the Examination of an Ancient Sepulchral MoundThe Ulster Journal of Archaeology

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