John Alexander Fladgate (1 January 1809 – 12 December 1901), was a port wine merchant.Fladgate was the son of Francis Fladgate (1773–1821), an Essex Street solicitor, friend of William Jerdan, who employed John Hamilton Reynolds from 1818 to 1820, and Maria Anne Bassett. He was christened in the church of St. Giles-in-the-Fields on 21 December 1809.