| 释义 |
- Legend
- Schedule
{{unreferenced|date=December 2018}}These are the late night schedules for the four United States broadcast networks that offer programming during this time period, from September 1999 to August 2000. All times are Eastern or Pacific. Affiliates will fill non-network schedule with local, syndicated, or paid programming. Affiliates also have the option to preempt or delay network programming at their discretion. Legend{{plainlist|- {{Color box|#abbfff|border=darkgray}} Light blue indicates Local programming.
- {{Color box|#C0C0C0|border=darkgray}} Gray indicates encore programming.
- {{Color box|yellow|border=darkgray}} Yellow indicates late night talk or variety shows.
- {{Color box|gold|border=darkgray}} Gold indicates network news programming.
}} Schedule | Network | 11:00 pm | 11:30 pm | 12:00 am | 12:30 am | 1:00 am | 1:35 am | 2:00 am | 2:30 am | 3:00 am | 3:30 am | 4:00 am | 4:30 am | 5:00 am | 5:30 am |
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| ABC | Local Programming | Nightline (11:35) | Politically Incorrect with Bill Maher (12:07) | Local Programming | ABC World News Now | Local Programming | ABC World News This Morning |
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| CBS | Local Programming | Late Show with David Letterman | The Late Late Show With Craig Kilborn | Local Programming | Up To The Minute | Local Programming | CBS Morning News with Julie Chen |
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| NBC | Local Programming | The Tonight Show with Jay Leno (11:35)
Saturday Night Live (Sat.) | Late Night with Conan O'Brien | Later (Mon-Thu)
Friday Night (Fri, 1:35-2:35) | Local Programming | Early Today |
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| FOX | MADtv (Sat.) | Local Programming |
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{{US TV schedule (late night)}}{{DEFAULTSORT:1999-2000 United States network television schedule (late night)}} 3 : United States late night network television schedules|1999 in American television|2000 in American television |