The eighth and final season of the American comedy television series That '70s Show premiered November 2, 2005 on Fox in the United States.

The eighth season marked a major change in the series, as the show's star Topher Grace who portrayed Eric Forman, the central character, left the series at the end of the previous season and was replaced by new character Randy Pearson (portrayed by Josh Meyers).

Eric was often mentioned throughout the season, even being an important off-stage character central to an episode's plot upon occasion.

Another big change to the show was the opening sequence that plays over the theme song; instead of the characters driving down a street in a car, they take turns singing lyrics of the theme song in "the circle", a camera angle used throughout the series when the group sits in a circle and gets intoxicated.

The last seconds of the series show the license plate of Eric's Vista Cruiser for the final time, now featuring a tag with the year "80" on it, signaling that the 1980s have begun.