Rinku Juneja, 27, who was lodged in jail No.1 in a robbery case, was found dead on Thursday evening by another inmate, jail officials said.
Juneja was lodged in Tihar two weeks ago. His family members have alleged that he was murdered by someone inside the jail.
Jail officials said that they have ordered a magisterial inquiry into the case.
This is the fourth death in Tihar prison in the past three weeks.