Several studies have shown an association between temperament and psychiatric disorders assessed in clinical and/or specific community samples. In Lebanon, the Temperament Evaluation of the Memphis, Pisa, Paris and San Diego-Auto questionnaire (TEMPS-A) has been used to evaluate temperament on a national sample of Lebanese adults as part of the Lebanese Evaluation of the Burden of Ailments and Needs Of the Nation (LEBANON) study. First results from this study have confirmed the aforementioned relationship between temperament and psychiatric disorders, including anxiety and mood disorders, albeit for the first time in a national sample. The effect of temperament is holding true even after controlling for sociodemographic factors such as age, gender, education, etc., all known to predispose individuals to mental disorders.