Trading psychology refers to the emotions and mental state that help to dictate success or failure in trading securities. Trading psychology represents various aspects of an individual's character and behaviors that influence their trading actions. Trading psychology can be as important as other attributes such as knowledge, experience and skill in determining trading success.

Discipline and risk-taking are two of the most critical aspects of trading psychology, since a trader's implementation of these aspects is critical to the success of his or her trading plan. While fear and greed are the two most commonly known emotions associated with trading psychology, other emotions that drive trading behavior are hope and regret.