1999-2000 Portuguese football season.
See main article: 1999–2000 Portuguese Liga. The 1999/2000 season of the Portuguese First Division began on August 20, 1999, and ended on May 14. Sporting CP became champions for the first time in eighteen years.
These teams were promoted from the Portuguese Second Division of Honour at the start of the season:
These teams were relegated to the Portuguese Second Division of Honour at the end of the season:
See main article: 1999–2000 Primeira Liga.