France
British Empire
Russian Empire (1914–17)
Kingdom of Italy (1915–18)
United States (1917–18)
Kingdom of Serbia
Kingdom of Romania (1916–18)
Empire of Japan
Belgium
Kingdom of Greece (1917–18)
Portugal (1916–18)
...and others
German Empire
Austria-Hungary
Ottoman Empire
Kingdom of Bulgaria (1915–18)
Co-belligerents
Jabal Shammar
...and others
George V
Nicholas II
Victor Emmanuel III
Woodrow Wilson
Ferdinand
Taishō
Peter I
Albert I
...and others
