The 2008–09 network television schedule for the six major English language commercial broadcast networks in the United States covers the prime time 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 season. The schedule omits the Public Broadcasting Service (whose programming is listed here).
NBC was the first to announce its fall schedule on April 2, 2008, followed by ABC and The CW on May 13, CBS on May 14, Fox on May 15, and MyNetworkTV on May 22. The CW unveiled its Sunday lineup on May 27, 2008.
PBS is not included; member stations have local flexibility over most of their schedules and broadcasts times for network shows may vary. The CW Plus is also not included as the service does not offer prime time programs of any kind, nor is Ion Television since the network's schedule consisted mainly of syndicated reruns and movies.
Each of the 30 highest-rated shows released in May 2009 is listed with its rank and rating as determined by Nielsen Media Research.