Batman is an ongoing American comic book series featuring the DC Comics hero of the same name. The character first appeared in Detective Comics #27 (cover dated May 1939). Batman proved to be so popular that a self-titled ongoing comic book series began publication with a cover date of Spring 1940.[2][3] It was first advertised in early April 1940, one month after the first appearance of his new sidekick, Robin, the Boy Wonder.

Though the Batman comic book was initially launched as a quarterly publication, it later became a bimonthly series through the late 1950s, after which it became a monthly publication and has remained so since. The original series ended in 2011 and was relaunched with a new first issue.