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Central Powers
 United Kingdom
 India Australia Canada- New Zealand
- South Africa
German Empire
Empire of Japan
Kingdom of Poland
Kingdom of Hungary
Kingdom of Belgium
Sublime State of Iran
Kingdom of Siam (1915-)
Ethiopian Empire (1915-)
Kingdom of Greece (1916-)
Tsardom of Bulgaria (1915-)
Co-Belligerents
United Arab Army (1916-)
Ukrainian Independence Army (1916-)
Russian United Front (1917-1918)
Confederate States of America (1914-1918)
Kingdom of Finland (1917-)
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Triple Entente
French Empire (1914-1918)
Third French Republic (1918-1919)
Russian Empire (1914-1917)
Russian Republic (1917-1918)
Kingdom of Italy (1914-1918)
Kingdom of Prussia (1914-1917)
Ottoman Empire (1914-1918)
Kingdom of Romania (1916-1918)
Kingdom of Serbia (1914-1917)
Co-Belligerents
United States (1914-1918)
All-Russian Military Government (1917-1918)
Boer Republic (1915-1917)
United Indian State (1915-1918)
Irish Republic (1916)
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