Helmuth Ehrhardt was a German psychiatrist.
Ehrhardt was a student of Werner Villinger. In a biography on Villinger, which Ehrhardt authored, he commended Villinger and Max de Crinis. Ehrhardt downplayed the seriousness of the crimes these men had committed with the Nazi T-4 Euthanasia Program. Ehrhardt later went on to serve on the executive board of the World Federation of Mental Health.