The history -- Research tips -- Timeline -- The countries -- Australia and New Zealand -- Austria-Hungary -- Belgium -- Brazil -- Bulgaria -- Canada and Newfoundland -- France -- Germany -- Great Britain -- Greece -- India -- Italy -- Japan -- Luxembourg -- The Ottoman Empire -- Poland -- Portugal -- Romania -- The Russian Empire -- Serbia and Montenegro -- South Africa -- The United States -- The neutral countries -- Aftermath -- Casualties and prisoners of war -- New countries

A guide to World War I service records covering the soldiers of all countries participating in the war