- Mar 2 British vice admiral Sackville Hamilton Carden begins bombardment of Dardanelles forts
- Mar 2 Vladmir Jabotinsky forms a Jewish military force to fight in Palestine
Elihu Root Retires
Mar 3 Elihu Root finishes his tenure as United States Senator from New York after choosing not to seek re-election
- Mar 3 US National Advisory Committee for Aeronautics (NACA) created, the predecessor of NASA
- Mar 5 World War I: The LZ 33, a zeppelin, is damaged by enemy fire and stranded south of Ostend.
Premier Venizelos Fired
Mar 6 Greek King Constantine I fires premier Venizelos
- Mar 8 1st US navy minelayer, Baltimore, commissioned
- Mar 10 British Army captures Neuve Chapelle, Belgium
- Mar 11 The British declare a blockade of all German ports
- Mar 13 Brooklyn Robins manager Wilbert Robinson tries to catch a baseball dropped from an airplane, but the pilot substitutes a grapefruit
- Mar 14 German cruiser Dresden scuttled off Más a Tierra, Chile, having been pursued by the Royal Navy after the Battle of the Falkland Islands, with her engines worn out and virtually no coal
- Mar 16 British battle cruisers Inflexible & Irresistible hit mines in Dardanelles
- Mar 16 Federal Trade Commission organizes
- Mar 18 Failed British attack in Dardanelles
- Mar 18 French battleship Bouvet explodes, 640 killed
- Mar 19 Pluto photographed for 1st time (although unknown at the time)
- Mar 19 VI Summer (Modern) Olympic Games: IOC President Pierre de Coubertin writes to Associated Press indicating 1916 Berlin Games won't take place because of WWI
- Mar 23 Zion Mule Corp formed by the British Army
- Mar 25 1st submarine disaster; a US F-4 sinks off Hawaii, killing 21
- Mar 25 German U boat torpedoes Netherlands merchant ship Medea
- Mar 26 77th Grand National: legendary jockey Jack Anthony wins his second of 3 GN's aboard 100/8 bet Ally Sloper
- Mar 26 Stanley Cup Final, Denman Arena, Vancouver, BC: Barney Stanley scores 5 goals as Vancouver Millionaires beat Ottawa Senators, 12-3 for a 3-0 sweep of first non-challenge series; Vancouver first PCHA champions
Typhoid Mary Arrested
Mar 27 Typhoid Mary [Mary Mallon] is arrested and returned to quarantine on North Brother Island, New York after spending five years evading health authorities and causing several further outbreaks of typhoid
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