The 2021 World Rugby Sevens Series was the 22nd annual series of rugby sevens tournaments for national men's rugby sevens teams. The Sevens Series has been run by World Rugby since 1999. Due to impacts of the COVID-19 pandemic, only two tournaments were played in the 2021 series instead of the usual ten. The number of teams participating was also reduced from sixteen to twelve at the tournaments, with many of the top teams from the previous series not taking part. The series was won by South Africa who won both tour events on their way to claiming their fourth World Series title.