Tianji may refer to:

Tianji.com, Chinese social networking website Tianji, Funan County, Anhui, China Tianji Subdistrict, Huainan, Anhui, China Guangxi Tianji F.C., Chinese football club Zeta Herculis, a star also named Tianji

See also Tian Ji ( 4th century BC), military general of the state of Qi