Stella Women's Academy, High School Division Class C3 (Japanese: 特例措置団体ステラ女学院高等科Ｃ3部, Hepburn: Tokurei Sochi Dantai Sutera Jo-Gakuin Kōtō-ka Shīkyūbu; lit. "Preferential Measure Organization Stella Women's Academy, High School Division Class C3"), also known by the abbreviation C3-Bu (C3部, Shīkyūbu), is a manga series written by Ikoma and illustrated by Tomomoka Midori. The manga, which is a follow-up to the 2010 web manga series Tokurei Sochi Dantai Stella Jo-Gakuin Chūtō-ka C3-Bu, was published in Kodansha's Monthly Young Magazine from May 2012 to December 2013. An anime television adaptation by Gainax aired in Japan between July and September 2013.

Yura Yamato has just transferred to the prestigious Stella Women's Academy (ステラ女学院, Sutera Jogakuin) and discovers that it is difficult to find friends in her first day at school. It is there that she comes across the school's airsoft club, aptly named the C3 Club (C3部, Shīkyūbu; derived from command, control and communications), and winds up becoming one of its members. The story revolves around Yura's experiences as a member of the C3 Club and her interactions with her fellow members.