This exploratory quantitative study tests the effectiveness of a three-hour Transgender Training Intervention for increasing the gender identity competence of counselors and counselors-in-training. Participants (N = 4) were recruited online and completed the 20-item Counselor Competence Gender Identity Survey (CCGIS) before and after the virtual training intervention. Data were analyzed using descriptive statistics. Results indicated that mean total CCGIS scores increased from 127.0 in the pretest to 138.75 in the posttest, a 9.25% increase. The largest gains were made on the Gaining Knowledge/Skills to Counsel Gender Diverse Individuals subscale (CCGIS-KS). Mean scores on the CCGIS-KS increased from 24.25 in the pretest to 32.0 in the posttest, a 31.96% increase. The study provides evidence that specialized training can increase the ability of counseling professionals to meet the needs of transgender clients. Counselors should seek such opportunities to better serve this highly marginalized population. This dissertation is available in open access at AURA (https://aura.antioch.edu) and OhioLINK ETD Center (https://etd.ohiolink.edu). [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.]