The purpose of this quantitative comparative study was to examine if and to what extent there was a statistically significant difference in the dimensions of Entrepreneurial Orientation (Innovativeness, Proactiveness, Risk-taking, Competitiveness, and Autonomy), individually, between Charter School Principals (CSP)s versus Traditional School Principals (TSP)s in Arizona. Lumpkin and Dess's theoretical foundation of a multidimensional construct of five entrepreneurial oriented behaviors was foundational to this research. Data from a convenience sample of 172 principals was collected using an online electronic 15-item two-way statement survey hosted on SurveyMonkey. The data were analyzed in SPSS a Mann-Whitney U-test on the five EO dependent variables of a single two-category independent variable, principal type. The results demonstrated that there was no difference in mean rank between Innovativeness (U = 3769, p = 0.926), Proactiveness (U = 3437, p = 0.276), Risk Taking (U = 3465, p = 0.315) and Autonomy (U = 3600, p = 0.548). However, there was a statistically significant difference in the mean rank (Charter = 78.25; Traditional = 96.29) for Competitiveness (U = 3012, p = 0.019). The failure to reject four of the five hypotheses suggests a need for further studies on EO of Arizona principals. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]