The 1999–2000 network television schedule for the six major English language commercial broadcast networks in the United States. The schedule covers primetime hours from September 1999 through August 2000. The schedule is followed by a of returning series, new series, and series cancelled after the 1998–99 season. PBS is not included; member stations have local flexibility over most of their schedules and broadcast times for network shows may vary. New series highlighted in bold. Each of the 30 highest-rated shows is listed with its rank and rating as determined by Nielsen Media Research.