1990–91 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 1990 to August 1991. 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.

ABC
Returning series
 * Into the Night Starring Rick Dees
 * Nightline

New series
 * In Concert '91

CBS
Returning series
 * CBS Late Night
 * CBS News Nightwatch

New series
 * America Tonight

Not returning from 1989-90:
 * The Pat Sajak Show

NBC
Returning series
 * Friday Night Videos
 * The George Michael Sports Machine
 * Late Night with David Letterman
 * Later With Bob Costas
 * Saturday Night Live
 * The Tonight Show Starring Johnny Carson

Fox
Returning series
 * Comic Strip Late Night