"About 20 heads of state have confirmed they will come to the celebrations in Warsaw," presidential spokesman Piotr Kownacki said.
The invitation list includes Russian President Dmitry Medvedev, U.S. President Georgia W. Bush, and Georgian President Mikheil Saakashvili.
During the celebrations, world leaders will watch the changing of the guard outside the Tomb of the Unknown Soldier in Warsaw, before having lunch in the Royal Castle and attending a ball in the Grand Theater.
Poland was divided between Prussia, Russia and Austria from 1795, when its commonwealth with the Grand Duchy of Lithuania collapsed, until the end of World War I in 1918.
The country has been constitutionally known as the Third Polish Republic since 1989, when communist rule ended, along with the Soviet influence that had lasted since the end of WWII while Poland was in the Eastern Bloc.