sentences:  List of longest-running U.S. broadcast network television series
  
  This is a list of the longest-running U.S. broadcast network television series, ordered by the number of broadcast seasons.To qualify for this list, the programming must originate in North America, be shown on a United States national (not regional) television network, and be first-run (as opposed to a repackaging of previously-aired material or material released in other media).