The Imposter phenomenon (IP) is prevalent in both academia and workplace. People who experience this phenomenon have difficulties in internalizing past success and achievement. Previous research has confirmed its diverse detrimental impact on both individual well-being and organizational effectiveness, thus devotes much effort into the investigation of its antecedents. Neuroticism and Conscientiousness of the Big Five are found to be the most important personality trait predictors. We contribute to this understanding by investigating the associations between HEXACO personality facets and the imposter phenomenon.