Several weeks ago, I put out my Business Book Tier List, where I arranged the business books I’ve read from most useful (S tier, A tier) to least useful (C tier, D tier). Today, I’m releasing my Sci Fi Book Series Tier List, where I arrange the science fiction book series I’ve read from most enjoyable to least enjoyable.

Note that this tier list specifically focuses on book series, where there are multiple related books that go together. For each series, I’ve included just one book to represent that series, but be aware that this is my ranking of the entire series (or as much as I’ve read of it so far), and not just that one book. If you’re interested in standalone science fiction books, check out my Sci Fi Standalone Book Tier List.

Without further ado, here is my Sci Fi Book Series Tier List (click on any book cover for my review and notes):

S

Some of my favorite book series of all time

A

Highly enjoyable book series

B

Reasonably enjoyable book series

D

Book series I didn't enjoy at all, or didn't finish

If you read any science fiction book series that you thoroughly enjoyed, but they aren’t in my list, or perhaps they are in the list, but you’d rank them differently, I’d love to hear about it in the comments!