1963–64 United States network television schedule (late night)

The 1963–64 United States network television schedule (late night) refers to the programming lineups broadcast by the three major American television networks – ABC, CBS, and NBC – during the late-night time slots (generally defined as after 11:00 PM Eastern Time) for the broadcast season that ran from September 1963 to August 1964. Late-night programming during this era consisted primarily of talk shows, variety shows, and syndicated reruns, often targeted towards adult audiences.

NBC dominated the late-night landscape with The Tonight Show Starring Johnny Carson, which established a format that became the standard for late-night talk shows. CBS offered a more varied lineup, including syndicated programming and attempts at competing late-night talk shows. ABC, being the smallest of the three networks at the time, generally offered a mix of syndicated content and limited original programming in the late-night hours.

The specific shows and their airtimes varied by network and local affiliate. Local stations often filled the late-night hours with syndicated programming or off-network reruns after the network's late-night offerings concluded. Significant events during this period, such as the assassination of President John F. Kennedy in November 1963, resulted in temporary schedule changes and news coverage extending into the late-night hours. The late-night television landscape of 1963-64 provides a window into the evolving entertainment preferences and cultural trends of the era.