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, on mineral waters, and on botany. He was a brother of the famous traveler Johann Georg Gmelin. He obtained his MD 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.