This article is about the courtroom psychiatrist, for the Victoria cross recipient see Bernard Diamond (VC).
Bernard Lee Diamond (December 8, 1912 – November 18, 1990) was a Professor of law and psychiatry at the University of California, Berkeley. He is primarily known for his contribution to what is known as forensic psychiatry. He was an expert witness for the defense in many well known trials, most notably the trial of Sirhan Sirhan, the killer of Robert Kennedy. The defense based much of their case on Diamond's testimony that Sirhan was suffering from diminished capacity at the time that he fired the deadly shots.
Due to his significant place in the Sirhan Sirhan trial, he figures prominently into a number of conspiracy theories regarding Robert Kennedy.