Russian Empire
Nicholas II– last Tsar of Russia, titular King of Poland, and Grand Duke of Finland. His rule ended with the Russian Revolution. Nicholas was killed on 17 July 1918.
Alexander Kerensky − Prime Minister of the Russian Provisional Government
Grand Duke Nicholas Nikolaevich – Commander-in-chief and viceroy in the Caucasus
Alexander Samsonov – Commander of the Russian Second Army for the invasion of East Prussia
Paul von Rennenkampf– Commander of the Russian First Army for the invasion of East Prussia
Nikolay Ivanov Commander of the Russian army on the Southwestern Front, responsible for much of the action in Galicia
Aleksei Brusilov – Commander of the south, then provisional Commander-in-Chief after the Tsar's abdication
Russian Soviet Federative Socialist RepublicRussian SFSR[edit]
Vladimir Lenin− Chairman of the Council of People's Commissars of the Russian SFSR
France
Raymond Poincaré– President of France, 1913–1920
Rene Viviani – Prime Minister of France 1914-1915
Joseph Joffre– Commander-in-Chief of the French Army and Marshal of France
Ferdinand Foch– Commander-in-Chief of the French Army and Marshal of France, "Generalissimo of the Allied Armies" from spring 1918
Robert Nivelle– Commander-in-Chief of the French Army
Philippe Pétain– Commander-in-Chief of the French Army and Marshal of France
United Kingdom of Great Britain and Ireland United Kingdom
George V– King of the United Kingdom and the other Commonwealth Realms, Emperor of India
H. H. Asquith – Prime Minister of the United Kingdom (until 1916)
David Lloyd George – Prime Minister of the United Kingdom (from 1916 to 1922)
Douglas Haig – Commander-in-Chief of the BEF
John Jellicoe – Commanding officer of the Grand Fleet (1914–1916), First Sea Lord (1916–1917)
Horatio Herbert Kitchener – Secretary of State for War (5 August 1914 – 5 June 1916)
Kingdom of Serbia
Peter I– King of Serbia
Crown Prince Alexander – Regent, Commander-in-Chief
Nikola Pašić – Prime Minister
Belgium
King Albert (left) with his wife the Queen, and Fuad I of Egypt (right).
Albert I of Belgium– King of the Belgians
Charles de Broqueville – Prime Minister (17 June 1911 – 1 June 1918)
Gérard Cooreman – Prime Minister (1 June 1918 – 21 November 1918)
Gérard Leman - Belgian general in the Battle of Liege
Kingdom of Italy
Victor Emmanuel III– King of Italy
Vittorio Orlando - Prime Minister of Italy at the end of the war.
Luigi Cadorna – Commander-in-Chief of the Italian army
Armando Diaz – Chief of General Staff of the Italian army
Luigi Amedeo – Commander-in-Chief of the Adriatic Fleet of Italy
Kingdom of Romania
Constantin Prezan – Chief of the General Staff of Romania
Alexandru Averescu – Prime Minister of Romania
USA
Woodrow Wilson– President of the United States
Thomas R. Marshall– Vice President of the United States
John J. Pershing– Commander of the American Expeditionary Force
Empire of Japan
Emperor Taishō– Emperor of Japan
Ōkuma Shigenobu – Prime Minister of Japan (16 April 1914 – 9 October 1916)
Terauchi Masatake – Prime Minister of Japan (9 October 1916 – 29 September 1918)
Hara Takashi – Prime Minister of Japan (29 September 1918 – 4 November 1921)
Brazil
Venceslau Brás – President of Brazil
Pedro Frontin – Brazilian Admiral
Dr. Nabuco Gouveia – Chief of the Brazilian Medical Delegation
Kingdom of Greece
Eleftherios Venizelos – Prime Minister
Pavlos Kountouriotis – Admiral
Panagiotis Danglis
Thailand Siam
Ramiha Gerazo VI – King of Siam
Leaders of the Central Powers (
- Kaiser Wilhelm II of Germany;
- Kaiser and King Franz Joseph of Austria-Hungary;
- Sultan Mehmed V of the Ottoman Empire;
- Tsar Ferdinand of Bulgaria.