World War I Casualties
(Source: Trenches on the Web)

| Mobilized Dead Wounded Missing/PoW |
| Russia 12,000,000 1,700,000 4,950,000 2,500,000 |
| Germany 11,000,000 1,773,700 4,216,058 1,152,800 |
| Great Britain 8,904,467 908,371 2,090,212 191,652 |
| France 8,410,000 1,375,800 4,266,000 537,000 |
| Austria-Hungary 7,800,000 1,200,000 3,620,000 2,200,000 |
| Italy 5,615,000 650,000 947,000 600,000 |
| US 4,355,000 126,000 234,300 4,526 |
| Turkey 2,850,000 325,000 400,000 250,000 |
| Bulgaria 1,200,000 87,500 152,390 27,029 |
| Japan 800,000 300 907 3 |
| Rumania 750,000 335,706 120,000 80,000 |
| Serbia 707,343 45,000 133,148 152,958 |
| Belgium 267,000 13,716 44,686 34,659 |
| Greece 230,000 5,000 21,000 1,000 |
| Portugal 100,000 7,222 13,751 12,318 |
| Montenegro 50,000 3,000 10,000 7,000 |