|Born||July 24, 1879|
|Died||February 25, 1958 (aged 78)|
|Known for||Past president, American Psychological Association|
|Thesis||Über die heterochrome Helligkeitsvergleichung (1909)|
|Doctoral advisor||Carl Stumpf|
Herbert Sidney Langfeld (July 24, 1879 – February 25, 1958) was an American psychologist and a past president of the American Psychological Association (APA).
Langfeld grew up in Philadelphia and was initially drawn to a diplomatic career. He was working for the American Embassy in Berlin when he was attracted to psychology. He earned a PhD in 1909 at the University of Berlin. He took a faculty position at Harvard University and ultimately went to Princeton University, where he became the psychological laboratory director and later the department chair for psychology.
Langfeld was APA president in 1930. He also held leadership positions with the International Congress of Psychology and the Psychology Section of the American Association for the Advancement of Science.