Philipp Friedrich Gmelin (19 August 1721 – 9 May 1768) was a professor of botany and chemistry. He studied the chemistry of antimony and wrote texts on the pancreatic ducts, mineral waters, and botany. He was a brother of the famous traveler Johann Georg Gmelin. He obtained his Master's degree in 1742, at the University of Tübingen under Burchard Mauchart. He was elected a Fellow of the Royal Society in 1758. He was the father of the naturalist Johann Friedrich Gmelin.

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