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- Aardvark
- Aaron
- Abacus
- Abbey, Edwin Austin
- Abbot
- Abbotsford
- Abbott, Sir John J.C.
- Abbott, John Stevens Cabot
- Abbott, Lynman
- Abbreviations
- Abdomen
- Abdul, Hamid II
- Abel
- Abelard, Pierre
- Abercrombie, James
- Aberdeen, John Campbell Gordon
- Aberdeen, Washington
- Aberration
- Abilene, Texas
- Abolitionists
- Abraham
- Abraham, Plains of
- Abrasives
- Abruzzi, Prince Luigi Amedeo
- Absalom
- Absinthe
- Absorption
- Abt, Franz
- Abydos, Egypt
- Abyssinia
- Acacia
- Academy
- Acadia
- Acanthus
- Acclimatization
- Accordion
- Accumulator
- Acentanilid
- Acetic
- Acetylene
- Achaeans
- Achan League
- Achard, Franz Karl
- Achates
- Achelous
- Acheron
- Achilles
- Acid
- Acis
- Aconcagua
- Aconite
- Acre
- Acropolis
- Actinism
- Actium
- Acts of the Apostles
- Actseon
- Adam and Eve
- Adam, Graeme Mercer
- Adams Apple
- Adams, Charles Francis
- Adams, Charles Francis Jr.
- Adams, Charles Kendall
- Adams, Henry
- Adams, Herbert Baxter
- Adams, John Quincy
- Adams, John
- Adams, Massachusetts
- Adams, Maude Kiskadden
- Adams, Samuel
- Adams, William Taylor
- Adder
- Adding Machine
- Addison, Joseph
- Addison, Margaret Elenor
- Address, Form of
- Ade, George
- Adelaide
- Adeler
- Aden, Gulf of
- Aden
- Adenoids
- Adhesion
- Adige
- Adirondack Mountains
- Adjutant Bird
- Adler, Felix
- Admetus
- Admiral
- Admiralty Island
- Admiralty Laws
- Adobe
- Adonis
- Adrenalin
- Adrian
- Adriatic Sea
- Adulteration
- Adventists
- Aegean Sea
- Aegospotami
- Aeneas
- Aeneid
- Aeronautics
- Aeschines
- Aeschylus
- Aesculapius
- Aesop
- Aesthetics
- Affidavit
- Affinity
- Afghanistan
- Africa
- Agate
- Agave
- Agent
- Agincourt, Battle of
- Agnosticism
- Agnus Dei
- Agouti
- Agra
- Agricola, Gnaeus Julius
- Agricultural College
- Agricultural Credits
- Agricultural Experiment Stations
- Agricultural Extension Work
- Agricultual Journals
- Agriculture, Department of
- Agriculture in High School
- Agriculture
- Aguinaldo, Emilio
- Ahab
- Ahasuerus
- Ahrens, Carl
- Aino
- Ainsworth, William Harrison
- Air
- Air Brake
- Air Compressor
- Air Engine
- Air Gun
- Air Plants
- Air Pump
- Aisne River
- Aix-la-Chapelle, Treaties of
- Ajax
- Akabah, Gulf of
- Akron, Ohio
- Alabama Claims
- Alabama River
- Alabama, University of
- Alabama
- Alabaster
- Aladdin
- Alameda, California
- Alamo
- Alaska
- Alba Longa
- Albani-Gye, Marie Louise
- Albania
- Albany Conventions
- Albany, Georgia
- Albany, New York
- Albany
- Albatross
- Albermarle Sound
- Albert Edward Nyanza
- Albert, Francis Charles Augustus
- Albert I
- Albert Lea, Minnesota
- Alberta
- Albia, Iowa
- Albino
- Albion, Michigan
- Albion, New York
- Albuquerque, New Mexico
- Alcestis
- Alcibiades
- Alcohol
- Alcoholism
- Alcott, Amos Bronson
- Alcott, Louisa May
- Alcuin
- Aldebaran
- Alden, Isabella Mcdonald
- Alden, John
- Alder
- Alderman, Edwin Anderson
- Alderney
- Aldrich, Nelson Wilmarth
- Aldrich, Thomas Bailey
- Ale
- Aleutian
- Alexander Archipelago
- Alexander I
- Alexander II
- Alexander, John White
- Alexander, Nevski
- Alexander the Great
- Alexander, William John
- Alexander
- Alexandra, Caroline Marie
- Alexandria, Louisiana
- Alexandria, Virginia
- Alexandria
- Alexandrian Library
- Alfalfa
- Alfieri, Vittorio
- Alfonso XIII
- Alsonfo
- Alford, Henry
- Alfred the Great
- Alga
- Algebra
- Algeciras
- Alger, Horatio
- Alger, Russell Alexander
- Algeria
- Algerine War
- Algiers
- Algol
- Algonquian
- Algonquin Park
- Alhambra
- Alias
- Alien and Sedition Laws
- Alien, Florence E.
- Alien, James Lane
- Alien
- Alimentary Canal
- Alizarin
- Alkali
- Alkaloid
- Alkanet
- All Saints' Day
- All Souls' Day
- Allahabad
- Allegheny Mountains
- Allegheny River
- Allegory
- Allen, Ethan
- Allenby, Sire Edmund Henry
- Allentown, Pennsylvania
- Alliance, Ohio
- Allibone, Samuel Austin
- Alligator Pear
- Alligator
- Allison, William Boyd
- Alliteration
- Allopathy
- Allotropy
- Alloy
- Allspice
- Allston, Washington
- Alluviium
- Allward, Walter Seymour
- Alam-Tadema, Sir Lawrence
- Almanac
- Almandine
- Almond
- Aloe
- Aloewood
- Alpaca
- Alpena, Michigan
- Alphabet
- Alps
- Alsace-Lorraine, France
- Altia
- Altgeld, John Peter
- Altitude
- Alton
- Altoona, Pennsylvania
- Alum
- Aluminum
- Alva, Fernando Alvarez De Toledo
- Alvarado, Pedro de
- Amalgam
- Amaranth
- Amarillo, Texas
- Amaryllis
- Amazon
- Amazons
- Ambassador
- Amber
- Ambergris
- Ambrose, Saint
- Ambrosia
- Ambulance
- Amendment
- America
- AAAS
- AFCS
- American Federation of Labor
- American Forestry Association
- American Legion
- American Party
- American System
- Americus, Georgia
- Americus Vespucius
- Ames, Fisher
- Ames, Iowa
- Amesbury, Massachusetts
- Amethyst
- Amherst, Jeffery
- Amherst
- Amicis, Edmondo de
- Amiens
- Ammeter
- Ammon
- Ammonia
- Ammonite
- Amoeba
- Ampere, Andre Marie
- Ampere
- Amphibia
- Amphictyonic
- Amphion
- Amsterdam, New York
- Amsterdam
- Amu
- Amundsen, Roald
- Amur
- Anabasis
- Anaconda, Montana
- Anaconda
- Anacreon
- Anaesthetic
- Ananias
- Anarchism
- Anatolia
- Anatomy
- Anaxagoras
- Ancestor Worship
- Anchor
- Anchovy
- Ancient Order of United Workmen
- Ancile
- Andalusia
- Andamans
- Andersen, Hans Christian
- Anderson, Indiana
- Anderson, Robert
- Anderson, South Carolina
- Anderson, Georgia
- Andes
- Andorra
- Andover, Massachusetts
- Andre, John
- Andree, Salomon August
- Andrew, John Albion
- Andrew
- Andrews, Elisha Bejamin
- Andromache
- Andromeda
- Andros, Sir Edmund
- Androscoggin
- Anemometer
- Anemone
- Angelico, Fra
- Angell, James Burrill
- Angell, James Rowland
- Angelus
- Angiosperm
- Angler
- Angleworm
- Anglican Communion
- Anglin, Margaret Mary
- Anglo-Saxon Chronicle
- Anglo-Saxon
- Angola
- Angora
- Anhinga
- Aniline
- Animal Worship
- Anise
- Ann Arbor, Michigan
- Annam
- Annapolis Convention
- Annapolis, Maryland
- Annatto
- Anne
- Annealing
- Anniston, Alabama
- Annunity
- Annunzio
- Anselm Saint
- Ansonia, Connecticut
- Ant
- Antaeus
- Antarctic
- Anteater
- Antelope
- Anthony, Daniel Read
- Anthony, Susan Brownell
- Anthracite
- Anthrax
- Anthropology
- Anti-Federalist Party
- Anti-Masonic Party
- Anticosti
- Antidote
- Antietam
- Antigo, Wisconsin
- Antigone
- Antilles
- Antimony
- Antioch
- Antiope
- Antipyrine
- Antiseptics
- Antisthenes
- Antitoxin
- AntoneFli, Giacomo
- Antoninus Pius
- Antonius, Marcus
- Antony, Saint
- Antwerp
- Anubis
- Aorta
- Apache
- Ape
- Apeninnes
- Aperies
- Aphasia
- Aphid
- Aphrodite
- Apiary
- Apis
- Apocalypse
- Apocalyptic Number
- Apocrypha
- Apollo
- Apoplexy
- Apostle Islands
- Apostles' Creed
- Apostles
- Apostolic Succession
- Apothecary
- Appalachian Mountains
- Appalachicola
- Appeal
- Appendicitis
- Apperception
- Appian Way
- Appius Claudius Crassus
- Apple of Discord
- Apple Worm
- Apple
- Appleton, Wisconsin
- Appomattox Courthouse
- Apricot
- April
- Apriori
- Apsides
- Apteryx
- Aquamarine
- Aquarium
- Aquarius
- Aquatic Plants
- Aqueduct
- Aquinas, Saint Thomas
- Arabia
- Arabian Sea
- Arabs
- Arachne
- Arachnida
- Arago, Dominique Francois
- Aragon
- Araguaya
- Aral
- Arapahoes
- Ararat
- Arbela, Battle of
- Arbitration, International Court of
- Arbitration International
- Arbitration
- Arbor Day
- Arbor Vitse
- Arbutus
- Arctic Ocean
- Arcadia
- Arch
- Archaeology
- Archangel
- Archery
- Archimedes' Screw
- Archimedes
- Architecture
- Archseopteryx
- Arcturus
- Areca
- Areopagus
- Arequipa
- Arethusa
- Argand Lamp
- Argenta, Arkansas
- Argentina
- Argon
- Argonaut
- Argonauts
- Argonne Campaign, Argun
- Argus
- Argyll, Campbells of
- Argyll, John Douglass Campbell
- Ariadne
- Aries
- Ariosto, Lodovico
- Aristides
- Aristippus
- Aristophanes
- Aristotle
- Arithmetic
- Arius
- Arizona, University of
- Arizona
- Ark of the Covenant
- Ark
- Arkansas City, Kansas
- Arkansas River
- Arkansas, University of
- Arkansas
- Arkwright, Sir Richard
- Arlington Heights, Massachusetts
- Arlington, Massachusetts
- Arlington National Cemetery
- Armada, Spanish
- Armadillo
- Armature
- Armenia
- Armenia
- Arminius
- Armor Plate
- Armour
- Armored Cruiser
- Armour, Philip Danforth
- Armstrong, William George
- Army, United States
- Army Worm
- Army
- Arno
- Arnold, Benedict
- Arnold, Matthew
- Arnold, Sir Edwin
- Arnold, Thomas
- Arnos
- Arrow
- Arrowroot
- Arsenal
- Arsenic
- Arson
- Art
- Artaxerxes
- Artemisia
- Artemus Ward
- Arteries
- Artesian Well
- Arthur, King
- Artichoke
- Articles of Confederation
- Articles, the Thirty-Nine
- Articulata
- Artificial Limbs
- Artillery
- Aruwimi
- Aryan
- Asefetida
- Asbestos
- Asbjornsen, Peter Christen
- Asbury, Francis
- Asbury Park
- Ascension
- Ascham, Roger
- Ascher, Isidore Gordon
- Asgard
- Ash Wednesday
- Ash
- Ashanti
- Ashburton Treaty
- Ashes
- Asheville, North Carolina
- Ashland, Kentucky
- Ashland, Wisconsin
- Ashtabula, Ohio
- Asia Minor
- Asia
- Asir
- Asp
- Asparagus
- Aspasia
- Aspen
- Aspahlt
- Asphodel
- Asquith, Herbert Henry
- Ass
- Assam
- Assay Office
- Assaying
- Assiniboin
- Associated Press
- Assuan
- Assumpsit
- Assyria
- Aster
- Asteroid
- Asthma
- Astor, John Jacob
- Astor, Nancy Langhorne
- Astoria, Oregon
- Astraea
- Astrakhan, Russia
- Astrakhan
- Astrology
- Astronomy
- Astrophotography
- Asuncion
- Atahualpa
- Atalanta
- Atchafalaya, River
- Atchison, Kansas
- Athabaska, Lake
- Athabaska, River
- Athanasius, Saint
- Athapascan
- Athens, Georgia
- Athens
- Atherton, Gertrude Franklin
- Atkinson,Edward
- Atlanta, Georgia
- Atlantic Cable
- Atlantic City, New Jersey
- Atlantic Ocean
- Atlas
- Atlas Mountains
- Atmosphere
- Atomic Theory
- Attachment
- Attainder
- Attar of Roses
- Attention
- Attila
- Attleboro, Massachusetts
- Auber, Daniel Francois
- Auburn, Maine
- Auburn, New York
- Audubon Society, The
- Audubon, John James
- Auerbach, Berthold
- Augeas
- Augsburg
- Augury
- August
- Augusta, Georgia
- Augusta, Maine
- Augustine, Saint
- Augustine
- Augustulus, Romulus
- Augustus II
- Augustus of Saxony
- Augustus
- Auk
- Aurelian
- Aurelius, Marcus
- Aurochs
- Aurora Borealis
- Aurora, Illinois
- Aurora
- Austen, Jane
- Austerlitz, Battle of
- Austin Academy
- Austin, Alfred
- Austin, Minnesota
- Austin, Stephen Fuller
- Austin, Texas
- Australia
- Australian Ballot
- Australia, Commonwealth of
- Austria-Hungary
- Austria
- Austrian Succession, War of the
- Autocrat of the Breakfast Table
- Automobile
- Auto Truck
- Autumn
- Avalanche
- Avernus
- Avesta
- Aviary
- Aviation
- Avacado
- Avocet
- Axiom
- Aylesworth, Sir Allen Bristol
- Ayr
- Azalea
- Azimuth
- Azores
- Azov
- Aztec
- Azurite
