César Augusto Cielo Filho (Portuguese pronunciation: , born 10 January 1987) is a Brazilian competitive swimmer who specializes in sprint events. He is the most successful Brazilian swimmer in history, having obtained three Olympic medals, winning six individual World Championship gold medals and breaking two world records.
Cielo is the current world record holder in the 50-metre freestyle (long course). His gold medal at the 2008 Summer Olympics, in the 50-metre freestyle competition, is Brazil's only Olympic gold in swimming to date. In 2008, he broke the NCAA record in the 50-yard (46 m) freestyle (18.47 seconds) and in the 100-yard (91 m) freestyle (40.92 seconds). Cielo became the fastest swimmer in the world in the two distances, and was named NCAA Swimmer of the Year for the second year in a row. Cesar currently lives and trains in Itajaí.
