Walc Stulecia (Polish for "Ball of the Century") is a science fiction novel published in 1998 by the Polish science fiction writer Rafał Ziemkiewicz. It was published in Poland by superNOWA. The novel received the prime Polish award for science-fiction literature, Janusz A. Zajdel Award, in 1998.
The book contrasts the society of belle epoque and a fictional vision of a 21st-century society. Painted in a pessimistic tone, it follows the story of a game developer working on the game entitled "Walc stulecia".