
Niu Jin (?-238) was an officer of Wei. He served four Cao rulers, and he was a subordinate of Cao Ren. He led an attack on Zhou Yu's camp at Nanjun, but was defeated and rescude by Cao Ren. In 238, Niu Jin was ordered to commit suicide by Sima Yi by drinking toxic wine because of his adultery and production of an illegitimate child with a member of the Sima clan.