In psychology, the dark triad comprises the personality traits of narcissism, Machiavellianism, and psychopathy. They are called dark because of their malevolent qualities.

Research on the dark triad is used in applied psychology, especially within the fields of law enforcement, clinical psychology, and business management. People scoring high on these traits are more likely to commit crimes, cause social distress and create severe problems for an organization, especially if they are in leadership positions. They also tend to be less compassionate, agreeable, empathetic, satisfied with their lives, and less likely to believe they and others are good.

All three dark triad traits are conceptually distinct although empirical evidence shows them to be overlapping. They are associated with a callous-manipulative interpersonal style.

Narcissism is characterized by grandiosity, pride, egotism, and a lack of empathy. Machiavellianism is characterized by manipulation and exploitation of others, an absence of morality, unemotional callousness, and a higher level of self interest. Psychopathy is characterized by continuous antisocial behavior, impulsivity, selfishness, callous and unemotional traits and remorselessness.

In the field of personality psychology, Machiavellianism is a personality trait centered on manipulativeness, callousness, and indifference to morality.