Allan McLane Hamilton (1848-1919) was an American psychiatrist of Scots descent, specializing in suicide and the impact of accidents and trauma upon mental health, and in criminal insanity, appearing at several trials. He was a founder of the New York Psychiatrical Society. He was a Professor of Psychiatry at Cornell Medical College in New York. He was the grandson of Louis McLane and Alexander Hamilton, the latter of whom he wrote a biography about.