Japan's military losses during the Second World War from 1937 to 1945, by region of military engagement

The Empire of Japan's military losses in the Second World War are estimated to exceed 2.5 million men. For Japan, the costliest front in the Pacific theater was the battle against the United States in the Philippines, closely followed by its invasion of China, known as the Second Sino-Japanese War. After 1941, the Imperial Japanese Army was simultaneously stretched across several frontlines in the Pacific theater, and this was one contributing factor to their eventual defeat as reinforcing and supplying various armies across these fronts was unfeasible in the long-term.