Jack Knife is a Japanese group from Osaka, Japan, active since 1981. It is described as a Japanese pop-punk girl trio, and its sound is associated with alternative rock, indie pop, indie rock, pop punk, power pop and twee pop. The named members are 中谷美智枝, 山野敦子, 山野直子, 西浦真奈, 種田律子, 絵美森本 and Risa Kawano.