1903 (MCMIII) was a common year starting on Thursday
- January 12 - The Russian Tsar confirms the confiscation of Armenian Church property.
- February 15 - Jean Jaures, French public figure, gives his speech about the the Armenian Genocide from 1894-1896 and criticizes the European countries position in that issue.
- July 29 - Demonstration in Alexandropol (Gyumri) against the confiscation of Armenian church property by the Russian Tsar.
- August 3 - Demonstration in Yerevan against the confiscating of Armenian Church properties by the Russian Empire.
- August 21 - Catholicos Mkrtich Khrimyan orders not to hand over church properties to the civil authorities.
- September 18 - battle of Barsen
- January 15 - Shmavon Arushanian, politician
- June 6 - Aram Khachaturian, composer (d. 1978)
- March 24 - Hrant Apresian, philosopher
- March 31 - Ashot Abrahamian, doctor and professor
- August 1 - Gurgen Mahari, writer (d.1969)
- November 20 - Goorgen Gabrielian, actor
- December 10 - Gurgen Janibekyan, actor (d.1956)