The Foudnation Universe contains not only books from the original trilogy, but also the prequels, sequels, and second trilogy, which all take place in the universe.

  • Foundation's Friends (this book was an honorary book about Isaac Asimov and his work on the series and the impact on other science fiction writers. It includes several legendary science fiction writers.

Since the Foundation Universe is mixed with the Robot and Empire series, the whole story spans over about 20,000 years and 15 books (although this wiki will only include those in the Foundation and maybe the Empire series.)