This is the complete episode listing for Star Trek: The Next Generation. The exact numbers of episodes vary sligthly depending on if you count double episodes as one or two. The series ran 7 full seasons, with 26 episodes per season (one aired every second weekend).
The inital airdate of the first episode, Encounter At Farpoint (Part 1), was August 28, 1987. The finale, All Good Things... (Part 2), was first aired on May 23, 1994.