Nine Allied national representatives signed Japan's surrender instrument in 1945.
After General Douglas MacArthur signed as Supreme Commander for the Allied Powers, national representatives signed for the United States, China, the United Kingdom, the Soviet Union, Australia, Canada, France, the Netherlands, and New Zealand. Their signatures followed the two Japanese signatures.
The number can be confusing because MacArthur's signature appears before the national delegates and represented the Allied command as a whole. The nine national signatories represented the governments whose forces and wartime cooperation formed the Allied coalition in the Pacific and the wider war.
The ceremony therefore included eleven principal signatures in sequence from Japan: Mamoru Shigemitsu and Yoshijiro Umezu, followed by MacArthur and the nine national representatives. The event was deliberately organized to recognize both the Allied command structure and the individual countries that had fought Japan.