Weekly Shōnen Sunday is a weekly shōnen manga magazine published in Japan by Shogakukan since March 1959. Contrary to its title, Weekly Shōnen Sunday issues are released on Wednesdays. Weekly Shōnen Sunday has sold over 1.8 billion copies since 1986, making it the fourth best selling manga magazine, only behind Weekly Shōnen Jump, Weekly Shōnen Magazine and Weekly Young Jump.

Shōnen manga is an editorial category of Japanese comics targeting an audience of adolescent boys. It is, along with shōjo manga, seinen manga, and josei manga, one of the primary editorial categories of manga. Shōnen manga is traditionally published in dedicated manga magazines that exclusively target the shōnen demographic group.