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- Nixon, Sir John Eccles
- Noble, Sir Andrew
- Nogi, Maresuke, Count
- Nolhac, Pierre de
- Nomography
- Nordica, Lilian
- Norfolk, Henry Fitzalan Howard, 15th Duke of
- North, Sir Ford
- North Carolina
- Northcliffe, Alfred Charles William Harmsworth, 1st Visct.
- North Dakota
- Northumberland, Henry George Percy, 7th Duke
- North-West Territories
- Norway
- Noske, Gustav
- Nova Scotia
- Novelli, Ermete
- Noyes, Alfred
- Noyon, Battle of
- Nursing
- Nyasaland Protectorate
- Obregón, Alvaro
- O'Brien, Peter O'Brien, 1st Baron
- Oceanography
- Ochs, Adolph S.
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- Odling, William
- Ohio
- Ohnet, Georges
- Ohrwalder, Joseph
- Oklahoma
- Okuma (Shigenobu), Marquess
- Ollivier, Olivier Émile
- Olney, Richard
- O'Neill, Norman
- Onnes, Heike Kamerlingh
- Ontario
- Optophone
- Orange Free State
- Ordnance
- Oregon
- Orelli, Hans Konrad von
- Orkney and Shetland
- Orlando, Vittorio Emanuele
- Orpen, Sir William
- Orthopaedic Surgery
- Orzeszko, Eliza
- Osler, Sir William
- Ostend
- Osteopathy
- Ottawa
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