Osomatsu-kun is a comedy manga series by Fujio Akatsuka which ran in Shogakukan's Weekly Shōnen Sunday magazine from 1962 to 1969. The series revolves around a group of sextuplet brothers who cause all sorts of mischief. It has been adapted into two different anime series of the same name, the first of which was produced by Studio Zero in 1966, and the second by Studio Pierrot in 1988. A new anime series by Pierrot, Mr. Osomatsu, began airing in October 2015 to celebrate Akatsuka's 80th birthday, with a manga adaptation by Masako Shitara serialized in Shueisha's You magazine from January 2016.

Fujio Akatsuka was a Japanese manga artist. Known as the Master of Gag Manga, he created many popular manga such as Osomatsu-kun, Himitsu no Akko-chan, and Tensai Bakabon.