We’ve gathered below the 60 most popular sci-fi novels on Goodreads over the past three years. As always, the collection is based on ratings and reviews from Goodreads members, and which books are ending up on those Read and Want to Read shelves. We’ve restricted the list to books that have an average rating of 3.5 stars and above. For series with multiple novels eligible in our three-year time span, we’ve included the most popular book in the series.