- February 2 - Ayn Rand, Author
- February 11 - Elizabeth Vuyk, Dutch/Indonesian writer.
- May 15 - Joseph Cotten, actor
- May 20 - Gerrit Achterberg, Dutch poet
- September 18 - Greta Garbo, Swedish actress.
- February 11 - Pope Pius X publishes the encyclical Vehementer nos.
- HMS Dreadnought is launched, revolutionizing battleship design and triggering a naval arms race.
- Abortive Russian Revolution of 1905, in response to Russia's defeat in the Russo-Japanese War
- Albert Einstein writes four papers that will change physics forever.
- June 7 - Norway declared the union with Sweden dissolved.
- October 26 - Sweden agreed to the repeal of the union with Norway