Educators have limited knowledge of youth mental health disorders, treatment, and school-based supportive strategies. Mental health literacy (MHL) interventions are designed to promote educator understanding of youth mental health. The Go-To Educator Training is a MHL intervention developed for educators. The current study extended research on the efficacy of the Go-To Educator Training by conducting a small randomized controlled trial with embedded mixed methods and virtual training delivery. We randomly assigned 34 middle school educators to treatment (n = 17) or waitlist control (n = 17). Participants' mental health knowledge, stigma, and self-efficacy were measured pre- and postintervention. We analyzed findings using multiple ANCOVAS from three approaches: intent-to-treat analysis using multiple imputation, intent-to-treat analysis assuming no change, and completer analysis. All approaches to the analysis found that after controlling for preintervention scores, participants who completed the Go-To Educator Training demonstrated higher postintervention MHL-ED knowledge (p < 0.001). There were mixed findings across analyses approaches for statistically significant impacts on stigma and self-efficacy measures. Six trained educators participated in semistructured focus groups or interviews. Coders used Qualitative Content Analysis to create main categories and subcategories. We integrated qualitative and quantitative results. Qualitative themes converged, diverged, and expanded upon the quantitative results by providing insight into the extent educators' noticed changes in their knowledge, stigma, self-efficacy, and behaviors. Educators endorsed that the training was socially valid, had many strengths, and areas for improvement. [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.]