William Warren (1839, Cambridge – 1914) was an English entomologist who specialised in Lepidoptera.
William Warren was first educated at Oakham School, and subsequently graduated at the University of Cambridge, taking first-class classical honours. He then taught at Doncaster Grammar School. He collected extensively in the British Isles, notably at Wicken Fen and on Micro-lepidoptera. After leaving Doncaster School he lived in Chiswick, London where he worked on Pyralidae and Geometridae in the British Museum (Natural History) and later, by the intervention of Albert Günther for the Tring Museum.Warren made collecting trips to the Punjab, Brazil and Japan. He was a Fellow of the Royal Entomological Society of London
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