John Walker Baily (1809–1873), was an archaeologist.
Baily was the brother of Charles Baily, and was born 9 January 1809, and died 4 March 1873. He was head of the firm of William Baily & Sons, and master of the Ironmongers' Company in 1862-3. He is chiefly known to archaeologists as having formed an important collection of Romano-British and mediæval remains unearthed by excavations in the City of London during the years 1862-72. This collection was purchased in 1881 by the Corporation of London for their museum of City antiquities. In the same year his collection of arms and armour, formed 1835-45, became the property of the Baron de Cosson, of Chertsey.
"Baily, John Walker". Dictionary of National Biography. London: Smith, Elder & Co. 1885–1900.