1978–79 United States network television schedule (late night)

These are the late night schedules on all three networks for each calendar season beginning September 1978. All times are Eastern/Pacific.

PBS is not included, as member television stations have local flexibility over most of their schedules and broadcast times for network shows may vary, CBS and ABC are not included on the weekend schedules (as the networks do not offer late night programs of any kind on weekends).

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

ABC
Returning Series
 * ABC Late Night

CBS
Returning Series
 * The CBS Late Movie

NBC
Returning Series
 * The Midnight Special
 * NBC Late Night Movie
 * Saturday Night Live
 * The Tomorrow Show
 * The Tonight Show Starring Johnny Carson

Not returning from 1977-78
 * Weekend