Sérgio Yoshio Sasaki Júnior (born March 31, 1992) is a Brazilian male artistic gymnast. He has collected a career tally of sixteen medals (six gold, eight silver, and two bronze) in a major international competition, spanning the Pan American Games, the Pan American Championships, and the South American Games. Sasaki also attended two editions of the Summer Olympic Games (2012 and 2016), as a member of the national team, reaching the final of the men's all-round both time.
He missed the 2015 World Championships due to a bicep injury.
At the 2009 Pan American Junior Championships, he won the floor, vault and parallel bars events and won bronze in the rings.