Joseph Sugar Baly MRCS FLS (1816 – 25 March 1890) was an English medical 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. One of the many species he described was Stethopachys formosa.

Works

• Catalogue of the Hispidae in the Collection of the British Museum.
• (with George Champion) Insecta. Coleoptera. Phytophaga (part). Vol. VI, Pt. 2 (1885-1894) Biologia Centrali-Americana