The Ringworld series is a series of science fiction novels written by American author Larry Niven. It is part of his Known Space series of stories. Its backdrop is the Ringworld, a giant artifact 600 million miles in circumference circling a star. The series is composed of four standalone science fiction novels, the original award-winning book and its three sequels:

Ringworld series
AuthorLarry Niven
IllustratorDean Ellis
CountryUnited States
LanguageEnglish
GenreScience fiction
PublishedAugust 1970 (1970-2012)

The companion novels to the Ringworld series are set in the same "Known Space" universe and all written by Niven and Edward M. Lerner: