Joseph Henry Longford (25 June 1849 in Dublin – 12 May 1925 in London) was a British consular official in the British Japan Consular Service from 24 February 1869 until 15 August 1902. He was Consul in Formosa (1895–97) after the First Sino-Japanese War and at Nagasaki (1897–1902).
Longford laboured long and hard to produce several readable and compendious books on Japan and as a member of the Japan Society of London was a strong supporter of maintaining good Anglo-Japanese relations. He realised that Britain held Hong Kong and Singapore only as long as the Japanese allowed her to do so, and urged the importance of studying Japan on British readers.
'Joseph Henry Longford (1849–1925), Consul and Scholar' by Ian Ruxton, Ch. 31, Britain and Japan: Biographical Portraits, Volume VI, ed. Hugh Cortazzi 2007, pp. 307–314, ISBN978-1-905246-33-5
The Correspondence of Sir Ernest Satow, British Minister in Japan (1895–1900), Volume One, from the Satow Papers held at The National Archives, Kew, London. published in full for researchers with notes by Ian Ruxton, Kyushu Institute of Technology, Lulu Press Inc., July 2005. ISBN1-4116-3857-3 (This book contains many letters from Longford to Sir Ernest Satow.)