Samisoni Viriviri Nasagavesi is a Fiji rugby union player. He played for the Fiji sevens team, and in 2014 won the World Rugby Sevens Player of the Year award after leading the 2013-14 World Rugby Sevens Series in tries scored.

The Fiji national rugby sevens team has competed in the World Rugby Sevens Series, Rugby World Cup Sevens and the Olympics. Fiji won the gold medal in the inaugural rugby sevens at the Summer Olympics in 2016 in Brazil, the country's first Olympic medal in any event, and repeated as Olympic champions in the 2020 Summer Olympics in Tokyo, defeating New Zealand. Thus Fiji is the sole nation to have won mens Olympic gold in the sport. They are the only country in the world to have won the Sevens Treble, the three major achievements in Sevens. They have won multiple World Rugby Sevens Series and Rugby World Cup Sevens.