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| 1903 |
| | | Erskine Childers has a best-seller in The Riddle of the Sands, a thriller about a planned German invasion of Britain | |
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| 1903 |
| | | King Alexander and Queen Draga of Serbia are murdered in their palace by army officers | |
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| 1903 |
| | | In a paper to a congress in Madrid, on the 'psychology and psychopathology of animals', Ivan Pavlov announces his discovery of the conditioned reflex | |
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| 1903 |
| | | Henry James publishes The Ambassadors, the second of his three last novels written in rapid succession | |
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| 1903 |
| | | Ernest Rutherford and Frederick Soddy identify the phenomenon of radioactive half-life | |
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| 1903 |
| | | Edward VII, the first British monarch to travel to India, holds a great coronation durbar in Delhi | |
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| 1903 |
| | | Roger Casement, British consul in the Congo Free State, discovers appalling abuses by Belgian companies | |
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| 1903 |
| | | Edwin S. Porter directs The Great Train Robbery, providing a big commercial success for Thomas Edison's film company | |
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| 1903 |
| | | Giuseppe Sarto is elected pope and takes the name Pius X | |
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| 1903 |
| | | British philosopher G.E. Moore publishes Principia Ethica, an attempt to apply logic to ethics | |
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