Series starting with O O

About this list

6 of them still run, while 14 have finished. 1 series already lists a dated next book. Finished series need no catching up, but a running one gains a new book from time to time.

Romance is the biggest shelf here, with 8 series. Fantasy has 4 and Thriller has 3. Since each shelf has its own page, you can narrow the list by genre.

The three biggest are October Daye (19), Oregon Files (19) and Orphan X (17). The shortest runs have only 3 books, such as The Original Shannara Trilogy. Both kinds get the same checks, because a short series can still hide a tricky order.

Elle Kennedy writes the most of them, with 3 series. In all, 19 authors are behind these series. Since each name links to an author page, you can follow a writer to their other work.

The oldest series with a known start began in 1968, and the newest began in 2021. Since the data comes from public records, a series with no known start year stays undated.

The soonest dated release here is Last Man Standing, from Orphan X, on 9 February 2027. Since publishers move dates, we recheck announced books weekly. Until a book is out, we label it announced rather than published.

A series can have more than one order. The publication order follows the release dates, while the chronological order follows the story. Where the two differ, the page shows both and says which one we would pick first.

Each series page shows the publication order, any chronological order and our recommended place to start. We also note where a novella or companion book can safely wait. Because the list runs A to Z, the letter bar takes you to any other part of the alphabet. If you would rather search, the search box finds any series by name, and the genre shelves group series by theme.

Looking for the same letter elsewhere? See authors under O and standalone books under O .