Mr. Osomatsu

is a Japanese comedy anime television series by Pierrot, based on Fujio Akatsuka's 1962 manga series, Osomatsu-kun. Celebrating Akatsuka's eightieth birthday, the series follows the sextuplet Matsuno brothers from the original series as adults, and features more adult-oriented humor compared to the original series. The series aired in Japan between October 2015 and March 2016, with a special episode airing in December 2016. A second season aired between October 2017 and March 2018, followed by a third season from October 2020 to March 2021. The first two seasons have been licensed in the Americas by Viz Media. A manga adaptation by Masako Shitaro was serialized in Shueisha's You magazine from January 2016 to October 2018. It was then transferred to Shueisha's Cookie magazine, where it continued serialization from November 2018 to November 2020. Three theatrical anime films based on the series premiered in March 2019, July 2022, and July 2023.