Kishore Singh v. State of Rajasthan, 1981 was a case heard by the Supreme Court of India that dealt with the issue of the use of third degree methods during police investigations and its violation of Article 21 of the Indian Constitution.

Article 21 of the Indian Constitution guarantees the right to life and personal liberty to all citizens of India. In this case, Kishore Singh, a suspect in a criminal investigation, alleged that he was subjected to third degree methods during his interrogation by the police. Third degree methods refer to the use of physical and psychological abuse, torture, and other forms of cruel and inhumane treatment to extract information or confessions from suspects.