Personality plays an important role in determining one's cognitive style, having a strong impact on the decision making of each person. Personality is a set of traits and qualities that form how somebody is, and it distinguishes us from others. At present, the most widely accepted personality theory is the big five factor, where personality is divided into five large traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism. These traits are independent of each other. On the other hand, several personality traits have been more strongly associated with psychopathology. Therefore, personality traits would be related to the production of several cognitive biases in all people because personality influences our own beliefs, and these can guide us to display certain types of biases. This chapter delves into the relationship between personality traits (especially openness, neuroticism, extroversion, and schizotypy) and cognitive biases.