This action research (AR) study explored practitioners' knowledge of Lesbian, Gay, Bisexual, Transgender, Questioning, and Intersex (LGBTQI) youth issues in a juvenile justice setting. A research and service approach was employed to develop a LGBTQI policy and training. This study was motivated by three research questions. Does sensitivity training increase practitioner knowledge concerning LGBTQI youth in juvenile justice? What are the attitudes of juvenile justice practitioners concerning the stigmatization of LGBTQI youth in a juvenile correctional setting? How can the findings of this study improve support networks for LGBTQI youth in a juvenile correctional setting? To examine these questions, pre-test and post-test data were obtained from (N = 164) practitioners and interviews were conducted with (N = 16) practitioners. The results revealed that practitioner knowledge about LGBTQI youth issues in juvenile justice increased. The results further indicated that demographic factors were not good predictors of such knowledge increase. Participant narratives highlighted and contested inequalities concerning the care and treatment, climatic conditions and affirming networks for LGBTQI youth in the juvenile justice system. Implications for policy, practice, and research were discussed. [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/en-US/products/dissertations/individuals.shtml.]