The research is a relational study aiming to determine the level of relationship between narcissistic personality tendencies and mobbing behaviors of school administrators and vice principals. The study group consists of 230 participants who were working in public schools in Mersin. The participants' narcissistic personality tendencies were determined by the "Narcissistic Personality Tendency Scale" and mobbing behaviors by the "Mobing Scale" and adapted into Turkish. According to the results of the research, while vice principals have a higher need for acceptance and approval, school administrators tend to value themselves. Vice principals apply the behaviors of inhibition about work and career, while school administrators apply mobbing behaviors more about commitment to work. As vice principals are criticized, they show more bullying behaviors. The narcissistic personality tendencies of school administrators significantly predict the behaviors of mobbing in the dimension of "commitment to work". Narcissistic personality tendencies of vice principals significantly predicted all sub-dimensions of mobbing behaviors.