Joseph Sugar Baly (1816 – 25 March 1890) was an English doctor and entomologist.
Born in Warwick where he would also die, Baly was a specialist in Coleoptera: Phytophaga. His collection is in the Natural History Museum, London.
Anthony Musgrave (1932). Bibliography of Australian Entomology, 1775-1930, with biographical notes on authors and collectors, Royal Zoological Society of News South Wales (Sydney) : viii + 380. Anonym 1889-1890: [Baly, J. S.] Proc. Linn. Soc. London , London 92-93 Sharp, D. 1890: [Baly, J. S.] L'Entomologiste 23 176, 197-200 Sharp, D. 1890: [Baly, J. S.] Entomologist's Monthly Magazine (3) 1