- Baguazhang - Start
- * Baboon - B
- * Baby - Start
- * Babylonia - B
- BACH motif - Start
- Back - Dab
- Back beat - Stub
- * Backgammon - GA
- Backpacking (wilderness) - Start
- Bad - Start
- Badger - Start
- Badlands - Stub
- * Badminton - GA
- Leo Baekeland - Start
- Bailey bridge - B
- Alexander Bain (inventor) - Start
- * John Logie Baird - B
- Bakelite - B
- Baking - Stub
- Equilibrioception - Stub
- Balaton
- Balcony
- Bald eagle
- Baldness
- Baldwin, James
- Ball
- Ball Badminton
- Ball, Lucille
- Ballet
- Balloon
- Ballooning
- Ballpoint pen
- Balustrade
- Balzac, Honore de
- Banana
- Band
- Band (music)
- Band saw
- Bandicoot
- Bandy
- Bangladesh
- Bank Holiday
- Bank of America
- Banneker, Benjamin
- Bar (music)
- Bar billiards
- Baran, Paul
- Barbados
- Barbarian
- Barbecuing
- Barbed wire
- Barbosa, José Celso
- Barbour, Edmund D.
- Bardeen, John
- Barn
- Barnacle
- Barnes & Noble
- Barometer
- Baroque
- Baroque music
- Barracuda
- Barretts disease
- Bartolomé de Las Casas
- Barton, Clara
- Basal Metabolic Rate
- Base
- BASE jumping
- Baseball
- Baseball card
- Basilica
- basilisk
- Basin
- Basket
- Basketball
- Basque pelota
- bass
- Bass
- Bass run
- Basset hound
- Bassline
- Basso
- Basso continuo
- Bastille Day
- Bastion
- Bat
- Bath
- Batman
- Battle of the Boyne
- Bauhaus
- Bay
- Bazooka
- BBC
- Be
- Beach
- Beach Handball
- Beach Rugby
- Beach Soccer
- Beach Volleyball
- Beam
- Bear
- Beat
- Beat (music)
- Beatles
- Beatmatching
- Beautiful
- Beauty
- Beaver
- Because
- Bechtel, Stephen
- Beckett, Samuel
- Bed
- Bed bug
- Bede
- Bee
- Beekeeping
- Beer
- Beet
- Beethoven, Ludwig van
- Beetle
- Before
- Begin, Menachem
- Begining of the Independence Movement
- Behavior
- Beijing
- Bel canto
- Belafonte, Harry
- Belarus
- Belgium
- Belief
- Belize
- Bell
- Bell
- Bell, Alexander Graham
- Benedict of Nursia
- Benenson, Peter
- Ben-Gurion, David
- Benin
- Bennett Jr., Lerone
- Bent
- Benz, Karl
- Berger, Hans
- Berlin
- Berlin wall
- Berliner, Emile
- Bermuda
- Bernard of Clairvaux
- Bernard, Claude
- Berners-Lee, Tim
- Berry
- Bessemer proces
- Bessemer, Henry
- Bethune Mary McLeod
- Between
- Bhatia, Sabeer
- Bhutan
- Biathlon
- Bible
- Bicycle polo
- Bicycle racing
- Bifocal
- Big bang
- Big History
- Big killer
- Bigfoot
- Bigotry
- Bikini
- Bill W.
- Billiards
- Binary form
- Biochemical pathology
- Biochemistry
- Biodemography of human longevity
- Bioethics
- Biogerontology
- Biological immortality
- Biological modeling
- Biology
- Bionic ear
- Bionicle
- Biosphere
- Biotechnology
- Bird
- Birdfeeding
- Birding
- Bird's-eye view
- Birdwatching
- Birth
- Bison
- Bissell, Melville
- Bit
- Bite
- Bitter
- Black
- Black panther
- Black Power
- Black widow
- Black-and-white
- Blackbird
- Blacksmith
- Blade
- Blake, Lyman R.
- Blake, William
- Blanchard, Jean Pierre
- Blanching
- Blessed Rainy Day
- Blitzball
- Blog
- Blood
- Blood work
- Blow
- Blucher
- Blue
- Blue jay
- Blue note
- Blue whale
- Blues
- Blues ballad
- Bluetooth
- Bluff
- BMW
- BMX racing
- Boa
- Board
- Board games
- Boat
- Bob Metcalfe
- Bobcat
- Bobsleigh
- Boccaccio, Giovanni
- Bocce
- Boccia
- Body
- Bodyboarding
- Bodybuilding
- Boggs, David
- Bohlen–Pierce scale
- Bohr, Niels
- Boiling
- Bolívar, Simón
- Bolivia
- Bombardier, Joseph-Armand Bombardier
- Bombay
- Bond, James
- Bone
- Bono
- Bonsai
- Booby
- Boogie woogie
- Book
- BookCrossing
- Boot
- Borges, Jorge Luis
- Bosch, Robert
- Bose, Jagdish Chandra
- Bosnia and Herzegovina
- boston terrier
- Botswana
- Bottle
- Bottle caps
- Bottle machine
- Bow
- Bowling
- Bowstring bridge
- Box
- Boxing
- Boxing Day
- Boy
- Brahms, Johannes
- Braille
- Braille music
- Braille, Louis
- Brain
- Brain death
- Brain-computer interface
- Braising
- Brake
- Branch
- Brandenburger, Jacques
- Brando, Marlon
- Brass
- Brattain, Walter
- Brazil
- Brazilian jiu jitsu
- Bread
- Breadmaker
- Break
- Brearley, Harry
- Breast
- Breath
- Brecht, Bertold
- Breech-loading flintlock
- Breech-loading weapon
- Breit, Gregory
- Brewster, David
- Brick
- Bridge
- Bright
- Brikwars
- Brining
- British opera
- Brockian Ultra-Cricket
- Broiling
- Broken
- Bronchitis
- Brontë, Charlotte
- Brontë, Emily
- Bronze
- Bronze Age
- Brooks, Gwendolyn
- Broomball
- Brother
- Brown
- Brownian motion
- Browning, John
- Brunei
- Brunel, Isambard Kingdom
- Brush
- Bubble Wrap
- Buber, Martin
- Buchanan, James
- Bucket
- Budapest
- Buddha
- Buddha, Gautama
- Buddha's First Sermon
- Buddhism
- Budding, Edwin Beard
- buffalo
- Bug
- Building
- Building restoration
- Bulb
- Bulgaria
- bull terrier
- Bulldog
- Bullfighting
- Bunche, Ralph
- Bungee jumping
- Bunsen burner
- Bunsen, Robert
- Buren, Martin Van
- Burger King
- Burkina Faso
- Burn
- Burnett, Leo
- Burst
- Burten, William M.
- Burundi
- Bus spotting
- Bush, George H. W.
- Bush, George W.
- Bushnell, David
- Business
- But
- Butter
- Butterfly
- Butterfly watching
- Button
- Buttress
- Buzkashi
- Buzzard
- By
- Byron
