# 1989–90 United States network television schedule (late night)

These are the late night schedules for the four United States broadcast networks that offer programming during this time period, from September 1989 to August 1990. 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

* Light blue indicates Local programming.
* Gray indicates encore programming.
* Yellow indicates late night talk or variety shows.
* Gold indicates network news programming.

## Schedule
### Monday-Friday

| Network | Network | 11:00 pm | 11:30 pm | 12:00 am | 12:30 am | 1:00 am | 1:30/1:35 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 |
| ABC | Fall | Local Programming | Nightline | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |
| ABC | Summer | Local Programming | Nightline | Into the Night Starring Rick Dees | Into the Night Starring Rick Dees | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |
| CBS | Fall | Local Programming | The Pat Sajak Show | The Pat Sajak Show | Local Programming | Local Programming | Local Programming | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch |
| CBS | Spring | Local Programming | Wiseguy | Wiseguy | CBS Late Night | CBS Late Night | Local Programming | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch | CBS News Nightwatch |
| NBC | NBC | Local Programming | The Tonight Show Starring Johnny Carson | The Tonight Show Starring Johnny Carson | Late Night with David Letterman | Late Night with David Letterman | Later With Bob Costas (Mon-Thu, 1:35) Friday Night Videos (Fri, 1:30-2:30) | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |
The Pat Sajak Show was reduced to 60 minutes on October 30, 1989.

### Saturday

| Network | Network | 11:00 pm | 11:30 pm | 12:00 am | 12:30 am | 1:00 am | 1:30 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 |
| NBC | NBC | Local Programming | Saturday Night Live | Saturday Night Live | Saturday Night Live | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |
| FOX | FOX | Comic Strip Live | Comic Strip Live | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |

### Sunday

| Network | Network | 11:00 pm | 11:30 pm | 12:00 am | 12:30 am | 1:00 am | 1:30 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 |
| NBC | NBC | Local Programming | The George Michael Sports Machine | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming | Local Programming |