| a cappella ... Abbas I |
| Abbas I ... Abd ar-Rahman |
| Abd ar-Rahman I ... Abengourou |
| Abenra ... Abington, Fanny |
| Abipon ... abstract art |
| Abstract Expressionism ... academic freedom |
| academy ... Accursius, Franciscus |
| accused, rights of ... acid and basic rocks |
| acid dye ... Acropolites, George |
| acrostic ... Adalbert |
| Adalbert, Saint ... Adamson, Joy; and Adamson, George |
| Adana ... Adhemar De Chabannes |
| Adhemar of Monteil ... Adolf |
| Adolf Frederick ... adverse possession |
| advertising ... Aepinus, Franz Maria Ulrich Theodor Hoch |
| Aepyornis ... Affenkapelle ware |
| affenpinscher ... Afrikaner Bond |
| Afrikaner-Broederbond ... Agatho, Saint |
| Agathocles ... Agnes, Saint |
| Agnesi, Maria Gaetana ... Aguan River |
| Aguarico River ... Ahmadiyah |
| Ahmadnagar ... Ailsa Craig |
| Aimard, Gustave ... aisling |
| Aistis, Jonas ... Akhmadulina, Bella |
| Akhmatova, Anna ... Alabama, University of |
| alabaster ... Alava |
| Alavi, Buzurg ... Albert |
| Albert ... Alboni, Marietta |
| Alborg ... alcohol |
| alcohol consumption ... Aleksandriya |
| Aleksandrov, Pavel Sergeevich ... Alexander III |
| Alexander III ... Alexis II |
| Alexis, Saint ... algebraic number |
| Algeciras ... aliphatic compound |
| Alipore ... Allegheny |
| Allegheny College ... Alligator Rivers |
| Alliluyeva, Svetlana ... Almirante Brown |
| Almohads ... alstonite |
| Alta ... alunite |
| alunogen ... Amanita |
| Amanollah Khan ... Ambo |
| Amboina Massacre ... American Baptist Churches in the U.S.A. |
| American Bar Association ... Americana |
| Americanism ... Amiot, Jean-Joseph-Marie |
| Amir Ali, Sayyid ... amortization |
| Amory, Thomas ... Amroha |
| Amrouche, Jean ... anacrusis |
| Anadarko ... Anastasia |
| Anastasia, Albert ... Ancud |
| Ancus Marcius ... Andersson, Dan |
| Andersson, Johan Gunnar ... Andrews, Fannie Fern Phillips |
| Andrews, Frank M ... Angarsk |
| angary ... Anglo-Dutch Wars |
| Anglo-Egyptian Condominium ... aniline |
| animal ... Annapolis Convention |
| Annapolis Royal ... Anser |
| anseriform ... anthomyiid fly |
| Anthony III Studite ... antideuteron |
| Antietam, Battle of ... antiparticle |
| antipasto ... Antrim |
| Antrim, Randal MacDonnell, Marquess and 2nd Earl of, Viscount Dunluce ... Apabhramsa language |
| Apache ... Apocynaceae |
| Apoda ... Appalachian Plateau |
| Appalachian Regional Commission ... aptitude test |
| aptronym ... arabesque |
| Arabia ... Aransas National Wildlife Refuge |
| Arany, Janos ... Arcadia |
| arcadia ... Archipenko, Alexander |
| Architects Collaborative, The ... Arendt, Hannah |
| Arenig Series ... Argos |
| Argostolion ... Ariosto, Ludovico |
| Arisaema ... Arkatag |
| Arkell, Anthony John ... Armenian massacres |
| Armenian rite ... Arnhem Land |
| Arnica ... Arras |
| Arras lace ... art and architecture, Mesopotamian |
| art and architecture, Oceanic ... arthrodire |
| arthropod ... Arun |
| Arunachal Pradesh ... Asbury, Francis |
| Ascanian Dynasties ... Asherah |
| Ashes ... asiento de negros |
| Asik Pasa ... Assam |
| Assamese language ... Astarte |
| astatine ... Astyages |
| Astyanax ... Athaliah |
| Athamas ... Atlantic Coast Conference |
| Atlantic Intracoastal Waterway ... Atreus, Treasury of |
| Atri ... Aubagne |
| Aube River ... Augmentations, Court of |
| Augrabies Falls ... auricular style |
| Aurignacian culture ... Australian literature |
| Australian National University ... automorphism |
| automotive ceramics ... Avery, John |
| Avery, Milton ... Awe, Loch |
| Awka ... Aytmatov, Chingiz |
| Ayton, Sir Robert ... |
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