1864 in birding and ornithology

Ongoing events
 * Spencer Fullerton Baird Review of American birds in the Museum of the Smithsonian Institution: pt. 1 Smithsonian Institution Washington, 1864–1872.online Birds described in this work include Sinaloa wren, Pacific wren, wood thrush and  black-capped gnatcatcher.
 * Birds described in 1864 include Tongan megapode, Livingstone's turaco, plain gerygone, lesser swamp warbler, ashy storm petrel,
 * Elliott Coues A critical review of the family Procellaridae Proceedings  Philadelphia Academy of Natural Science.
 * Lost land of Lemuria postulated.
 * Thomas C. Jerdon publishes The Birds of India. Volume II, Part I and The Game Birds and Wildfowl of India
 * Death of Christian Ludwig Brehm
 * John Gould The birds of Australia; Supplement 1851–69. 1 vol. 81 plates; Artists: J. Gould and H. C. Richter; Lithographer: H. C. Richter
 * John Gould The birds of Asia; 1850-83 7 vols. 530 plates, Artists: J. Gould, H. C. Richter, W. Hart and J. Wolf; Lithographers:H. C. Richter and W. Hart
 * The Ibis