Phon Sangsingkeo (or Fon Saengsingkaew, Thai: ฝน แสงสิงแก้ว) (April 24, 1907- 1980) is a Thai medical doctor whose studies on factors that contribute to the mental well-being of a person earned him the Ramon Magsaysay Award for Government Service in 1966. His holistic approach led him to integrate how the rapid advancement of technology and cultural changes affect mental health, resulting in a more humane treatment of mental patients thus putting the dictum "treat the person as a person" in practice. For this, he is known as the father of modern psychiatry in Thailand.