The 1999–2000 World Sevens Series was the first season of the global circuit for men's national rugby sevens teams, organised by the International Rugby Board (now known as World Rugby). The series ran from December 1999 to May 2000 and incorporated ten tournaments spread over five continents. New Zealand was the series champion, winning five of the tournament events. Fiji finished as runner-up, eight points behind despite winning the remaining five tournaments. The leading try-scorer for the inaugural season was Fiji's Vilimoni Delasau, who notched 83 tries over the series.