Flávio Vianna de Ulhôa Canto (born April 16, 1975 in Oxford, England) is a Brazilian judoka who competed in Men's 81 kg Judo.
He won the bronze medal at the 2004 Summer Olympics.
He is founder and president of the Instituto Reação, and also presenter of the TV shows Corujão do Esporte on TV Globo and Sensei on SportTV.