Category:Military units and formations of World War I by country

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• Military units and formations of the United States in World War I (6 C, 19 P)
• Military units and formations of New Zealand in World War I (5 C, 15 P)
• Military units and formations of France in World War I (3 C, 54 P)
• Military units and formations of Russia in World War I (3 C, 36 P)
• Military units and formations of Italy in World War I (4 C, 16 P)
• Military units and formations of Germany in World War I (7 C, 23 P)
• Military units and formations of Poland in World War I (2 C, 8 P)
• Military units and formations of Serbia in World War I (7 P)
• Military units and formations of India in World War I (4 C, 3 P)
• Military units and formations of the Ottoman Empire in World War I (1 C, 57 P)
• Military units and formations of Austria-Hungary in World War I (1 C, 10 P)
• Military units and formations of Canada in World War I (2 C, 23 P)
• Military units and formations of the United Kingdom in World War I (3 C, 6 P)
• Military units and formations of South Africa in World War I (20 P)
• Military units and formations of Portugal in World War I (4 P)
• Military units and formations of Australia in World War I (3 C, 27 P)
• Military units and formations of Rhodesia in World War I (3 P)
• Military units and formations of Greece in World War I (1 C, 18 P)
• Military units and formations of Belgium in World War I (3 P)
• Military units and formations of the British Empire in World War I (7 C, 7 P)