The aim of this quantitative study was to explore the connection between self-perceived cultural proficiency among school leaders and the discipline gap for Black students in high schools in North Texas. The study sought to achieve this by: (a) identifying the level of cultural proficiency perceived by school leaders, (b) examining the disciplinary rates of Black students in each participating high school, and (c) exploring how school administrators' beliefs regarding cultural proficiency impacted the disciplinary rates of Black students on their campuses. To assess their implementation of cultural proficiency practices, Hine's cultural proficiency leadership framework was utilized. The study found a significant positive correlation between the total cultural proficiency score and the number of out-of-school suspensions for Black students, while a negative correlation was observed for White students. Additionally, a positive correlation was observed between the total cultural proficiency score and the number of in-school suspensions for Black students, while no statistically significant correlation was found for White students. The participants in the study met three criteria: (a) working at a 5A or 6A UIL-identified campus in North Texas, (b) having at least 9% of the student population identified as Black and African American, and (c) serving as school leaders responsible for assigning exclusionary discipline. [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://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]