Agent J is the ninth studio album by Taiwanese singer Jolin Tsai. It was released on September 21, 2007, by EMI and Mars. Agent J was produced by Lars Quang, Nik Quang, RnG, Adia, Paul Lee, Michael Lin, Paula Ma, and Jamie Hsueh. It was released alongside the film under the same name, which was directed by Jeff Chang, Marlboro Lai, and Kuang Sheng, and it features Kim Jae-won, Stephen Fung, and Carl Ng.

Jolin Tsai is a Taiwanese singer, songwriter, and actress. Known as the "Queen of C-pop", she is one of the most influential pop cultural figures in the Chinese-speaking world. Recognized for her continual reinvention and versatility in musical style and visual image, she is regarded as a key figure in bringing dance-pop music into the mainstream in Greater China. She assumes creative control over all aspects of her career, and her works, which incorporate themes of societal issues and ideological connotations, have garnered both commercial success and critical acclaim.