- 2 Animal attacks
- 5 Animal behavior
- 2 Animal feeding
- 1 Animal Magnetism
- 4 Animal shelters (welfare buildings)
- 1 Animal training
- 4 Animal welfare
- 834 Animals
- 10 Animals (set of 10 etchings)
- 2 Ann Street
- 9 Anna (Biblical prophetess)
- 1 Annas, High priest, 1st cent.
- 19 Anne (Mother of the Virgin Mary), Saint
- 4 Anne (Mother of the Virgin Mary), Saint - Selbdritt
- 1 Annenberg, Walter H., 1908-2002
- 121 Annex to Art Gallery
- 13 Annex to Main Building
- 2 Annexes (building divisions)
- 3 Announcements
- 2 Annual reports
- 40 Annunciation to the Blessed Virgin Mary
- 1 Anshutz, Joseph
- 1 Ansonia Brass & Copper Co.
- 1 Antarctica
- 1 Antelopes
- 1 Antennas
- 1 Anterooms
- 1 Anthony, Jacob, 1792-1875
- 9 Anthony, of Egypt, Saint, c. 250-350 CE
- 4 Anthony, of Egypt, Saint, ca. 250-355 or 6
- 5 Anthracite
- 2 Anthracite Building
- 1 Antiaircraft guns
- 3 Anti-Catholicism
- 3 Antietam Creek
- 1 Antietam, Battle of, Md., 1862
- 1 Antimony
- 1 Anti-Nazi movement
- 746 Antiphonaries
- 1 Antiques Picker
