2008–09 United States network television schedule (late night)

The 2008–09 network late night television schedule for the four major English-language commercial broadcast networks in the United States cover the late night hours from September 2008 to August 2009. The schedule is followed by a list per network of returning series, new series, and series canceled after the 2007-08 television season.

Network		11:00 p.m.	11:35 p.m.	12:00 a.m.	12:30 a.m.	1:00 a.m.	1:30 a.m.	2:00 a.m.	3:00 a.m.	4:00 a.m.	4:30 a.m.	5:00 a.m.
ABC		Local programming	Nightline	Jimmy Kimmel Live! (12:05 a.m.)		Local programming		ABC World News Now				America This Morning
CBS			Late Show with David Letterman		The Late Late Show with Craig Ferguson (12:35 a.m.)		Local programming	Up to the Minute				CBS Morning News
NBC	Fall		The Tonight Show with Jay Leno		Late Night with Conan O'Brien		Last Call with Carson Daly	Poker After Dark	The Tonight Show with Jay Leno (R)	Local programming	Early Today	Local programming
	Spring		The Tonight Show with Jay Leno		Late Night with Jimmy Fallon				Late Night with Jimmy Fallon (R)
	Summer		The Tonight Show with Conan O'Brien		Late Night with Jimmy Fallon				Late Night with Jimmy Fallon (R)

Network		11:00 p.m.	11:30 p.m.	12:00 a.m.	12:30 a.m.	1:00 a.m.
Fox	Fall	MADtv		Talkshow with Spike Feresten	Local programming
	Winter	Talkshow with Spike Feresten		MADtv (R)	Local programming
	Spring	MADtv		Talkshow with Spike Feresten		Local programming
NBC		Local programming	Saturday Night Live			Local programming (1:02)

Legend