Challenges resulting in poor employee engagement emerge when the reality of an increasingly globalized business landscape contributing to an expanding multicultural workforce is ignored or mismanaged, which includes difficulties with organizational commitment, cross-cultural interpersonal relations, employee satisfaction, and retention of employees. The effectiveness of fostering engagement in a culturally diverse workforce is relative to the meaning managers make of cultural differences. To make a real and meaningful impact on managers' effectiveness as leaders of employee engagement, cultural development strategies must affect the efficacy of both knowledge and skill, transcending simple awareness by advancing the capacity to adapt behavior to cultural differences. The purpose of this qualitative, instrumental case study was to inform the effectiveness of cultural development strategies by understanding how managers' intercultural competence influences their contributions to employee engagement. One overarching question was addressed: How do managers' intercultural competence influence their contributions to employee engagement? Additionally, the following three questions informed the overarching question and guided the research: a) How do managers describe their management experiences and approaches contributing to employee engagement, b) In what ways is IC reflected in managers' descriptions of their management experiences and approaches contributing to employee engagement, and c) How are managers' descriptions of their management experiences and approaches contributing to employee engagement different and similar across IC developmental orientations? A total of six managers participated in this study by completing the Intercultural Development Inventory™ and participating in individual interviews. The findings of this study revealed that managers' perceptions and behavioral approaches around employee engagement reflect their intercultural competence and suggest a need for targeted cultural development strategies. [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.]