1978–79 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 1978. All times are Eastern/Pacific.

Talk/Variety shows are highlighted in yellow, Local News & Programs are highlighted in white.

Monday-Friday

-	11:00 PM	11:30 PM	1:00 AM	1:30 AM	2:30 AM	4:30 AM
ABC	Local	ABC Late Night				Local
CBS	local programming	The CBS Late Movie		Local
NBC	local programming	The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/NBC Late Night Movie to 1:30 (Sun.)	The Tomorrow Show (Mon.-Thru.)/The Midnight Special (Fri)		local programming

Saturday

-	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	local programming	Saturday Night Live			local programming

Spring 1979

-	11:00 PM	11:30 PM	1:00 AM	1:30 AM	2:30 AM	4:30 AM
ABC	Local	ABC Late Night				Local
CBS	local programming	The CBS Late Movie		Local
NBC	local programming	The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/NBC Late Night Movie to 1:30 (Sun.)	The Tomorrow Show (Mon.-Thru.)/The Midnight Special (Fri)		local programming

Summer 1979

-	11:00 PM	11:30 PM	1:00 AM	1:30 AM	2:30 AM	4:30 AM
ABC	Local	ABC Late Night				Local
CBS	local programming	The CBS Late Movie		Local
NBC	local programming	The Tonight Show Starring Johnny Carson/Saturday Night Live (Sat.)/NBC Late Night Movie to 1:30 (Sun.)	The Tomorrow Show (Mon.-Thru.)/The Midnight Special (Fri)		local programming

By network

ABC

Returning Series

ABC Late Night

CBS

Returning Series

The CBS Late Movie

NBC

Returning Series

Not returning from 1977-78

Weekend