1990–91 United States network television schedule (late night)

These are the late night Monday-Friday schedules on all three networks for each calendar season beginning September 1990. All times are Eastern/Pacific.

Talk/variety shows are highlighted in yellow, network news programs in gold, and local news & programs are highlighted in white background.

Fall 1990

- 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
ABC local programming ABC News Nightline Into the Night Starring Rick Dees local programming
CBS local programming America Tonight CBS Late Night local programming CBS News Nightwatch
NBC local programming The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/The George Michael Sports Machine (Sun., 11:30-12:00) Late Night with David Letterman Later with Bob Costas/Friday Night Videos (Fri., 1:30-2:30) local programming

Winter 1990/1991

- 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
ABC local programming ABC News Nightline Into the Night Starring Rick Dees local programming
CBS local programming America Tonight CBS Late Night local programming CBS News Nightwatch
NBC local programming The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/The George Michael Sports Machine (Sun., 11:30-12:00) Late Night with David Letterman Later with Bob Costas/Friday Night Videos (Fri., 1:30-2:30) local programming

Spring 1991

- 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
ABC local programming ABC News Nightline Into the Night Starring Rick Dees local programming
CBS local programming CBS Late Night CBS News Nightwatch
NBC local programming The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/The George Michael Sports Machine (Sun., 11:30-12:00) Late Night with David Letterman Later with Bob Costas/Friday Night Videos (Fri., 1:30-2:30) local programming

Summer 1991

- 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
ABC local programming ABC News Nightline Into the Night local programming
CBS local programming CBS Late Night CBS News Nightwatch
NBC local programming The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/The George Michael Sports Machine (Sun., 11:30-12:00) Late Night with David Letterman Later with Bob Costas/Friday Night Videos (Fri., 1:30-2:30) local programming
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