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William Kitchen Parker FRS (23 June 1823 – 3 July 1890) was an English physician, zoologist and comparative anatomist. From a humble beginning he became Hunterian Professor of Anatomy and Physiology in the College of Surgeons of England.
He was elected a Fellow of the Royal Society in 1865, awarded the Royal Medal in 1866. From 1871–73 he was President of the Royal Microscopical Society, and in 1885 he received the Baly Medal of the Royal College of Physicians.