Popular psychology (sometimes shortened as pop psychology or pop psych) refers to the concepts and theories about human mental life and behavior that are supposedly based on psychology and are considered credible and accepted by the wider populace. The concept is cognate with the human potential movement of the 1950s and 1960s.

The term pop psychologist can be used to describe authors, consultants, lecturers, and entertainers who are widely perceived as being psychologists, not because of their academic credentials, but because they have projected that image or have been perceived in that way in response to their work.

The term is often used in a pejorative fashion to describe psychological concepts that appear oversimplified, out of date, unproven, misunderstood or misinterpreted; however, the term may also be used to describe professionally produced psychological knowledge, regarded by most experts as valid and effective, that is intended for use by the general public.

Popular psychology commonly takes the form of:

Popular psychology is an essential ingredient of the self-help industry.

According to Fried and Schultis, criteria for a good self-help book include "claims made by the author as to the book's efficacy, the presentation of problem-solving strategies based on scientific evidence and professional experience, the author's credentials and professional experience, and the inclusion of a bibliography."

Three potential dangers of self-help books are:

The misuse and overuse of technical psychological terms is called psychobabble.