John Hartley Durrant (10 January 1863 in Hitchin – 18 January 1928 in Putney) was an English entomologist who specialised in Lepidoptera. Durrant was an authority on nomenclature. He was Lord Walsingham's secretary and had charge of his collections. When these were left to the Natural History Museum, London Walsingham provided funds for Durrant to continue to curate them. He was author, with Lionel Walter Rothschild, of Lepidoptera of the British Ornithologists' Union and Wollaston Expeditions in the Snow Mountains, Southern Dutch New Guinea; Macrolepidoptera. Tring, Zoological Museum (1915) and many scientific papers on Lepidoptera.