Chūnin

are ninja who are qualified to watch over and guide other ninja. Chunin have reached a level of maturity that primarily consists of leadership skills and tactical prowess. This is because the Genin who don't have the skills to become Chunin are weeded out in testing. Some of them, like Iruka Umino and Mizuki, function as teachers and others, like Shikamaru Nara, serve as team leaders in charge of small teams who need to make decisions and utilize the skills of the shinobi under their command to the maximum effect. Chunin are typically sent on C-Rank or B-Rank missions. Sometimes, in times of peace, leaders like Shikamaru may become teachers at the Ninja Academy, as seen in the filler arcs.

To become a Chunin, a Genin participates in a large examination, known as the Chunin Exams. The only exam seen in the series is a three-stage exam held in Konohagakure. Those who pass the test and become Chunin can wear an identifying flak jacket that holds ninjutsu scrolls. This vest is not mandatory; instead, some opt for more elaborate clothing like capes and robes.