Much of the research on implicit theories has focused on theories of intelligence. The aim of the present study was to examine how implicit theories of emotion were associated with positive and negative indicators of well-being via cognitive reappraisal. College students (n = 355) answered relevant questionnaires. Results indicated that entity theory of emotion (thinking that emotions are uncontrollable) was detrimental to well-being. Entity theory of emotion negatively predicted the use of reappraisal. Entity theory of emotion was positively associated with negative emotions, anxiety, and depression, while at the same time being negatively associated with life satisfaction and positive emotions. The effects of entity theory of emotion were partially mediated by cognitive reappraisal. Theoretical and practical implications are discussed. •Entity theory of emotion was negatively associated with well-being•Entity theory of emotion negatively predicted reappraisal.•Reappraisal was positively associated with positive indices of well-being.•Reappraisal partially mediated the effects of entity theory on well-being.