Late night television in the United States

Late night television is the general term for television programs produced for broadcast during the late evening and overnight hours—most commonly shown after, if not in competition with, local late-evening newscasts; programs that have been showcased in the daypart historically (though not necessarily exclusively) encompassed a particular genre of programming that falls somewhere between a variety show and a talk show. Late-night shows predominantly cater to night owls, people suffering from insomnia, shift workers with irregular schedule assignments, younger male audiences and college students, along with spillover audiences through viewers of entertainment and news programs aired earlier in the evening.

In the United States, the late night slot primarily encompasses the "late fringe" daypart leading out of prime time (and typically encompassing the half-hour to 35-minute "late news" slot associated with local and, in some cases, network late-evening newscasts), usually running after 11:00 p.m. and through 2:00 a.m. Eastern and Pacific Time (ET/PT). An informal broader definition of the daypart includes the designated overnight graveyard slot (encompassing programs airing as late as 5:00 a.m. local time).

This article focuses on television programs, genres and other programming concepts common in American late night television, primarily focusing on programs typically shown on national broadcast and cable television networks and in syndication.