This exploratory study was an examination of the relationship between mindfulness awareness and impostor phenomenon in clinical counseling supervisors. A quantitative, nonexperimental approach was used to evaluate the following research questions: Is there a significant relationship between the factors of gender, age, years of supervisory experience, the frequency of mindful practice, type of mindful practice, and mindfulness awareness (MA) among clinical counseling supervisors? Is there a significant relationship between the factors of gender, age, years of supervisory experience, the frequency of mindful practice, type of mindful practice, and impostor phenomenon (IP) among clinical counseling supervisors? A sample of 113 clinical counseling supervisors completed a survey containing a demographic survey, the Impostor Phenomenon Scale, and the Mindfulness Awareness Assessment Scale. Data collection took place online, and the relationship between mindfulness awareness and impostor phenomenon was analyzed utilizing multiple regression analysis. The results showed a negative correlation between mindfulness awareness and impostor phenomenon in clinical counseling supervisors. Gender, days per week practicing, and the use of mixed practices, meditation, yoga, and other practices were statistically significant predictors of mindfulness awareness. The negative correlation demonstrated a continued need for additional evaluation of these relationships so that more can be learned about the impact of mindfulness awareness and impostor phenomenon on clinical counseling supervisors. The results of this research support the development of mindfulness training programs to help supervisors overcome impostor phenomenon.