Earlier studies suggest that individual differences in fl ow experiencesdepend on both situational variables, e.g. the environmental opportunities to engagein fl ow promoting activities, and personal traits. Here, we present results of phenotypicanalyses of associations between fl ow proneness and fi ve major modalities ofindividual differences, i.e. personality, cognitive abilities, motivation, emotionalcompetence (alexithymia) and performance on chronometric tasks. The data wascollected using self-report questionnaires in a cohort of more than 10,000 Swedishtwin individuals. The aim of the study was partly exploratory, but we also addressedthree specifi c hypotheses suggested by earlier literature, i.e. that fl ow proneness is(i) correlated with personality, specifi cally with traits refl ecting emotional stability(low neuroticism) and conscientiousness; (ii) unrelated to cognitive ability; and (iii)correlated with trait intrinsic motivation. The results confi rmed all three hypotheses.Additional main fi ndings were that fl ow proneness is related to extraversion, agreeableness,openness to experience, low schizotypy, and emotional competence (lowalexithymia). Sex differences in fl ow proneness were mostly negligible, but fl owproneness increased weakly with age. In summary, individual differences in fl owproneness show substantial relations to personality related traits but appear essentiallyindependent of cognitive abilities. We conclude that the results taken togethersupport the notion of fl ow proneness being related to an autotelic personality, anddiscuss the potential implication of relations between the observed correlates offl ow proneness and outcomes related to health and well-being.