This study investigated the personality correlates of three dimensions of subjective well-being (S WB): Positive affect, negative affect, and life satisfaction. Participants in two samples completed daily mood reports and a number of relevant personality inventories. Interpersonal competencies were found to correlate most strongly with positive affect, internal emotional states with negative affect, whereas the correlates of life satisfaction included both interpersonal competencies and internal emotional states. In general, results supported Costa and McCrae's (1980) model postulating two different sets of personality traits that influence positive and negative affect separately.