Baito-kun (バイトくん, "Part-timer-kun") is a yonkoma manga by Hisaichi Ishii serialized in the Kansai area information magazine Play Guide Journal (プレイガイドジャーナル, Purei Gaido Jānaru) beginning in 1972.

This was Ishii's debut professional work.

In addition to being a long-running series in the magazine, many of the characters from Ishii's later series first made their appearances in this series.

[1] The story takes place at the fictional Higashi Yodogawa University, though it is modeled on Ishii's alma mater Kansai University.

The main characters are poor students living at a boarding house (Nakano-sō), and follows their experiences at and as they travel to and from home, work, and school, covering everyday experiences.