Category:Comic series

Main article: Comic series

The xkcd strips that are part of a comic series are directly related to each other, rather than simply sharing a recurring topic. A series must be composed of at least three comics, and it must be clear that Randall intentionally created it as a series. This can usually be inferred from similar patterns in the comics' titles (xkcd Phones) or captions (Cursed Connectors), sequential numbers in the titles (Stargazing), release dates purposefully deviating from the normal schedule (Journal), a partnership with other artists (Guest Week) or companies (A Smarter Planet), or Randall simply posting a list of all the comics that are part of a series (The Boy and his Barrel).

Many of the early comic series have been released in a series of five consecutively released comics, with each episode being released on a weekday. After 2010, no series followed a similar release schedule, as they all followed the normal shedule of three comics a week.