An ongoing series refers to a comic book title published in sequential order on a regular basis (usually monthly) without a predetermined or finite conclusion. Many ongoing titles have been prematurely canceled due to poor sales however. An ongoing series is the opposite of a limited or mini-series which is published with a predetermined set number of issues. Action Comics is the longest running American comic book series of all time and is still in publication today.

See also: Category:One Shots, Category:Last Issues, and Category:Limited Series