Seinen manga (青年漫画?) are manga marketed to adolescent boys and men old enough to read kanji. In Japanese, the word "" literally means "youth", but the term "seinen manga" is also used to describe the audience of comics like Weekly Manga Times and Weekly Manga Goraku which are aimed at men into their 50s. Seinen manga are distinguished from shōnen manga which are for younger boys, as well as the seijin-muke, or hentai, manga (成人向け漫画?) which focus on sex, although some seinen manga like xxxHolic share some similarities with "shōnen" manga. Seinen manga can focus on action, politics, science fiction, fantasy, relationships, sports, or comedy and while they may contain sexual content (as well as other mature material), it remains predominantly more infrequent than in the seijin-muke manga. The female equivalent to seinen manga is josei manga.
Seinen manga have a wide variety of art styles and variation in subject matter. Examples of seinen series include: 20th Century Boys, Akira, Tokyo Ghoul, Berserk, Mushishi, Ghost in the Shell, Planetes, Maison Ikkoku, and the formerly shōnen manga JoJo's Bizarre Adventure.