- Browne, Sir Benjamin Chapman
- Browning, John M.
- Bruce, Sir David
- Bruce, Sir Gainsford
- Bruges
- Brunner, Henry
- Brunner, Sir John Tomlinson
- Brunton, Sir Thomas Lauder
- Brussels
- Brussilov, Alexei
- Bryan, William Jennings
- Bryant, Sophie
- Bryce, James Bryce, 1st Viscount
- Buccleuch, William Henry Walter Montagu-Douglas-Scott, 6th Duke of
- Buchan, Alexander
- Buchan, John
- Buckle, George Earle
- Buckmaster, Stanley Owen Buckmaster, 1st Baron
- Buckner, Simon Bolivar
- Bucknill, Sir Thomas Townsend
- Budapest
- Budge, Sir Ernest Alfred Wallis
- Buenos Aires
- Buffalo
- Bulgaria
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- Bullard, Robert Lee
- Bullen, Arthur Henry
- Bullen, Frank Thomas
- Bülow, Bernhard Heinrich Karl Martin, Prince von
- Bülow, Karl von
- Bunting, Sir Percy William
- Burbidge, Sir Richard
- Burdett, Sir Henry
- Burian von Rajecz, Stephen, Baron
- Burleson, Albert Sidney
- Burnand, Sir Francis Cowley
- Burnet, Sir John James
- Burnett, Frances Eliza Hodgson
- Burnham, Edward Levy Lawson, 1st Baron
- Burnham, Daniel Hudson
- Burns, John
- Burns and Scalds
- Burroughs, John
- Burrows, Ronald Montagu
- Burt, Thomas
- Butcher, Samuel Henry
- Butler, Henry Montagu
- Butler, Nicholas Murray
- Butler, Sir William Francis
- Butt, Clara
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- Buxton, Sydney Charles Buxton, 1st Viscount
- Byng, Julian Hedworth George Bing, 1st Baron
- Bywater, Ingram
- Cable, Submarine Telegraph
- Cadbury, George
- Cadogan, George Henry Cadogan, 5th Earl
- Cadorna, Count Luigi
- Caillaux, Joseph-Marie-Auguste
- Cailletet, Louis Paul
- Caine, Sir Thomas Henry Hall
- Cairo
- Calgary
- California
- California, University of
- Calmette, Gaston
- Cambon, Paul Pierre
- Cambrai, Battle of
- Cambrai-St. Quentin, Battle of
- Cambridge
- Cameron, James Donald
- Cameroon
- Cammaerts, Émile
- Camouflage
- Campbell, Beatrice Stella
- Campbell, Sir Francis J.
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- Campbell, Reginald John
- Camp Fire Girls
- Camps and Cantonments
- Canada
- Canalejas y Méndez, José
- Cancer
- Caneva, Carlo
- Canteen
- Capello, Luigi
- Cape Province
- Capes, Bernard Edward Joseph
- Cape Town
- Capitalism
- Caporetto, Battle of
- Capps, Edward
- Carinthia
- Carlisle, George James Howard, 9th Earl of
- Carnegie, Andrew
- Carnock, Arthur Nicolson, 1st Baron
- Carolus-Duran
- Carpathians, Battle of the
- Carpenter, William Boyd
- Carr, Joseph William Comyns
- Carranza, Venustiano
- Carrel, Alexis
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