William Warren (20 January 1839, in Cambridge – 18 October 1914, in Hemel Hempstead) was an English entomologist who specialised in Lepidoptera.
William Warren was first educated at Oakham School, and subsequently graduated from the University of Cambridge, taking first-class classical honours in 1861.
He collected extensively in the British Isles, notably at Wicken Fen, with a special interest in Micro-lepidoptera.
After giving up teaching in 1882, he lived in Cambridge and devoted himself fully to entomology, publishing around 40 papers on British moths between 1878 and 1889.
[3] In 1888, he moved to Chelsea, London, where he worked as a professional entomologist on Pyralidae and Geometridae in the British Museum (Natural History) and later, by the intervention of Albert Günther, for the Tring Museum, publishing over 80 more papers (partial list below).