The quantitative study examined the impact of intercultural competency training on Education Support Professionals (ESP) through pre- and post-testing using the Intercultural Development Inventory (IDI®). The IDI® is based upon Bennett's Developmental Model of Intercultural Sensitivity (DMIS). The examination of ESP intercultural competency was based on their Development Orientation (DO), Perceived Orientation (PO) and Orientation Gap (OG) IDI® scores prior to and after the intercultural training. The study utilized a non-experimental pre- and post-test design with a sample group of 20 Education Support Professionals (ESP) who were members of a large midwestern state education labor union. Prior to the intercultural training, study participants completed the IDI® (the pre-test) to determine their placement on the IDI® Intercultural Development Continuum. Participants then completed 24 hours of intercultural training which included an additional five hours of service learning and three one-hour debrief/coaching sessions. Once the training was completed, participants were administered the IDI® (the post-test) to assess the impact of the intercultural competency training. Based on the data analysis participants significantly increased their intercultural competence on all three IDI® components after the intercultural training. Participants had meaningful growth on the IDI® Intercultural Development Continuum. Additionally, participants more accurately rated their intercultural competency after the training than before the training. Data also demonstrated the intercultural competency training had a statistically significant and large effect on the training group. The study concluded that educational institutions should offer equitable access to intercultural competency training for Education Support Professionals (ESP) during paid employee work hours. It is further recommended that professional learning communities be created to support continued post-training employee development of intercultural skillsets. [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.]