The beliefs people hold about emotion are clearly relevant for emotional processes, although the social psychological research on malleability or “lay” beliefs about emotion are rarely integrated with the clinical research on emotional schemas. In the current study, we examine a variety of beliefs about emotion (e.g., beliefs that emotions can be changed, beliefs that negative emotions are bad, beliefs that emotions should not be expressed, beliefs that emotions control behavior, beliefs that emotions last “forever”) along with other emotion belief measures and measures of psychopathology (general psychological distress, borderline personality), emotion dysregulation, interpersonal emotional attributions (emotional expressivity, interpersonal emotion regulation) and psychological flexibility (mindfulness, emotional intelligence). In a combined sample of undergraduates (n = 162) and adults from Mechanical Turk (n = 197), we found that beliefs about the longevity and uniqueness of emotions were unique predictors of psychopathology, even after controlling for age and gender. We also found that after controlling for symptoms of psychopathology, beliefs about longevity and that negative emotions are bad predicted greater emotion dysregulation and lower mindfulness. Beliefs that emotions should be kept to the self and a preference of logic over emotion predicted less emotional expressivity, interpersonal emotion regulation, and emotional intelligence. Beliefs that emotions control behavior also predicted lower mindfulness. Finally, when asked whether they think their beliefs change during strong emotions, people who said their beliefs change (about two-thirds of the sample) reported higher symptoms of psychopathology, higher emotion dysregulation, higher use of interpersonal regulation strategies and lower mindfulness.