Mr. Tonegawa: Middle Management Blues is a Japanese manga series written by Tensei Hagiwara and illustrated by Tomohiro Hashimoto and Tomoki Miyoshi. It is a spin-off of the main series Kaiji by Nobuyuki Fukumoto. It was serialized in Kodansha's Monthly Young Magazine from June 2015 to January 2018, and later moved to Comic Days manga app in March 2018 and finished in June 2020. Its chapters were collected in ten tankōbon volumes. The series comically depicts the struggles and conflicts of Tonegawa, a middle manager who is an executive of the Teiai Group and leads a large number of blacksuits, but is most concerned about the mood of the tyrannical Chairman Hyōdō.

An anime television series adaptation by Madhouse aired from July to December 2018 on Nippon TV's AnichU programming block. Sentai Filmworks have licensed the anime and an English dub began streaming on Hidive in August 2018. The show is also available for viewing on Crunchyroll.

As of November 2018, the manga had over 2.9 million copies in circulation.