- Fall 1977
- Winter 1977/1978
- Spring 1978
- Summer 1978
{{unreferenced|date=March 2013}}These are the late night Monday-Friday schedules on all three networks for each calendar season beginning September 1977. All times are Eastern/Pacific. Talk/Variety shows are highlighted in yellow, Local News & Programs are highlighted in white. Fall 1977| - | 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 | ABC Late Night | Local |
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| CBS | local programming | The CBS Late Movie | Local |
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| 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.-Thur.)/The Midnight Special (Fri)/Weekend (Sat.) | local programming |
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Winter 1977/1978| - | 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 | ABC Late Night | Local |
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| CBS | local programming | The CBS Late Movie | Local |
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| 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.-Thur.)/The Midnight Special (Fri)/Weekend (Sat.) | local programming |
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Spring 1978| - | 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 | ABC Late Night | Local |
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| CBS | local programming | The CBS Late Movie | Local |
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| 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.-Thur.)/The Midnight Special (Fri)/Weekend (Sat.)/ | local programming |
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Summer 1978| - | 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 | ABC Late Night | Local |
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| CBS | local programming | The CBS Late Movie | Local |
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| 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.-Thur.)/The Midnight Special (Fri)/Weekend (Sat.) | local programming |
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{{US TV schedule (late night)}}{{DEFAULTSORT:1977-1978 United States Network Television Schedule (Late Night)}} 3 : United States late night network television schedules|1977 in American television|1978 in American television |