Chūnin

are ninja who have reached a level of maturity and ability that primarily consists of leadership skills and tactical prowess. Chūnin are typically sent on C-rank or B-rank missions. Some chūnin, such as Iruka Umino and Shino Aburame, move on to become Academy teachers.

To become a chūnin, genin participate in a large examination, known as the Chūnin Exams. Those who pass the test and become chūnin are eligible to 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.

As a result of the peaceful era that the Five Great Shinobi Countries established after the Fourth Shinobi World War, the number of chūnin has decreased.