Happiness is related to extraversion, neuroticism and self-esteem (Hills, Argyle, 2001). In addition to these factors, the study examines the relationships between happiness, emotional autonomy, and self-concept clarity. A group of 400 students (14- to 20-years-old) completed the subsequent instruments: Eysenck Personality Inventory, Emotional Autonomy Scale, Self-concept Clarity Scale, Rosenberg Self-esteem Scale, Oxford Happiness Inventory (OHI). Correlation coefficients and multiple regressions showed significant links between the OHI total score and the other constructs under examination (p < .001). Moreover, hierarchical regressions highlighted differential contributions of the predictors in relation to overall happiness, its sub-factors scores and cognitive components