January 1, 1903
1903 treaty between Cuba and the United States
Ilinden–Preobrazhenie Uprising — Revolt against the Ottoman Empire in Southeastern Europe 1903
1903 Tour de France — cycling race
1903 Italian Football Championship — sports season
6.3-magnitude earthquake that struck Muş in eastern Turkey on April 27, 1903
1903 treaty between the United States and Colombia
25 Feb 1903 shootout in Stanaford, West Virginia, USA
1903 Isfahan anti-Baháʼí riots
Armed incident between Peru and Ecuador
1903 riot in Evansville, Indiana