The purpose of this generic qualitative study was to understand licensed professional counselors' perceptions of ethics and diversity implications for serving youth identifying as sexual and gender minorities. The research question at the center of this endeavor asked what are licensed professional counselors' perceptions of ethics and diversity implications for serving sexual and gender minority youth? And the subquestion asked how do licensed professional counselors' perceptions of ethics and diversity implications for serving sexual and gender minority youth inform Counselor Education and Supervision? Utilizing the purposive sampling method and one instance of snowball sampling, the study included data from 10 participants. Semi-structured interviews were the primary data collection tool. The sample was licensed professional counselors between the ages of 23 and 85 living in one of the five major geographic regions of the United States, who attended a graduate program based in the United States, and whose licenses were in good standing with their state boards. Participants described clinicians denying counseling to sexual and gender minority youth. Through the guided interviews data emerged in the form of participants' perceptions. The data included perceptions concerning clinicians' lack of competency for counseling sexual and gender minority youth which implicated counselor educators. This generic qualitative study aligned with social constructivist theory, a lens to explore licensed professional counselors' perceptions of ethics and diversity implications for serving sexual and gender minority youth. The constructivist foundation allowed participants to collaborate, openly sharing beliefs, opinions, and perceptions in a safe and supportive environment. The researcher fostered that collaboration through warmth and acceptance throughout the research process. The researcher's rapport with the participants and the constructivist foundation strengthened the collaborative nature of this study exploring counselors' perceptions. Inductive analysis was used to search the collected data for recurring words or ideas, highlighting important data related to the research question and subquestion. Themes were identified from patterns the researcher coded by grouping participants' ideas and use of similar phrases. This thorough analysis facilitated the researcher's intimacy with the data, a process resulting in categories and ultimately the three themes (counselor training and preparation, clinicians' competency, and clinicians' advocacy). Subthemes emerged from the first main theme: graduate programs, continuing education, and recommendations. And a subtheme emerged from the second main theme: ethical factors. The results of this study documented the perceptions of licensed professional counselors concerning ethics and diversity implications for counseling sexual and gender minority youth. The study described perceptions regarding clinicians denying service to sexual and gender minority youth as well as practitioners' unethical practices related to competently serving this population. Unethical practices implicated counselor education programs and faculty who train clinicians. The results of this study may assist counselors and counselor educators through heightened understanding of competency issues affecting mental health counselors' approach to serving sexual and gender minority youth. [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.]