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.

Legend
Light blue indicates local programming.

Gray indicates encore programming.

Yellow indicates late night talk or variety shows.

Gold indicates network news programming.

Monday-Friday
Note: The Tonight Show with Jay Leno ended its first run on May 29, 2009, with The Tonight Show with Conan O'Brien premiering on June 1, 2009. Note: Late Night with Conan O'Brien ended on February 20, 2009, with Late Night with Jimmy Fallon premiering on March 2, 2009.

ABC
Returning series
 * Jimmy Kimmel Live!
 * Nightline

CBS
Returning series
 * Late Show with David Letterman
 * The Late Late Show with Craig Ferguson

Fox
Returning series
 * MADtv
 * Talkshow with Spike Feresten

NBC
Returning series
 * Last Call with Carson Daly
 * Late Night with Conan O'Brien
 * Saturday Night Live
 * The Tonight Show with Jay Leno

New series
 * The Tonight Show with Conan O'Brien
 * Late Night with Jimmy Fallon