The New Series Adventures are a series of spin-off novels based on the long-running BBC science fiction television series Doctor Who and published under the BBC Books imprint. The range of books does not have an official name. Fans use the term "New Series Adventures" or "New Series Books" in order to distinguish them from other Doctor Who book ranges.

Others further divide them into "Ninth Doctor Adventures" and "Tenth Doctor Adventures" although there is no distinction in format between the two. Although the books make reference to events in the television series, they rarely make reference to each other, therefore the books can usually be read in any order. They have Gallifreyan numerals on the spine indicating the suggested order.

In "Doctor Who Files: The Doctor", there is a section on Gallifreyan numbers. The book illustrates a Base-7 number system instead of decimal or Base-10 system. For example on the novel The Price of Paradise, the number on the spine can be translated to 000015 in Base-7 or in decimal it is Book 12.

Inside the books, chapters are numbered in the same way, with the thirteenth chapter carrying the same image as the eleventh. The current publishing schedule for the line, which has been in effect since publishing began in 2005, is three books released simultaneously in the spring, followed by three simultaneous publications in the autumn. Beginning in 2006, the line also added a novella published in the spring.

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