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Objective: Cognitive-behavioral therapy for insomnia (CBT-I) is an effective insomnia treatment but has yet to be applied to adolescents with sleep disruption following concussion. This pilot study evaluated CBT-I to improve insomnia in adolescents with protracted concussion recovery., Setting: Tertiary pediatric hospital., Participants: Participants (N = 24) were 12 to 18 years old (M = 15.0, SD = 1.4), 15.1 weeks (SD = 9.2) postinjury, and presenting with sleep disruption and persistent postconcussion symptoms., Design: A single-blind, parallel-group randomized controlled trial (RCT) design comparing 6 weeks of CBT-I and a treatment-as-usual control group. Outcomes were measured before treatment, at treatment completion, and 4 weeks after completion., Main Measures: Primary outcome was Insomnia Severity Index. Secondary outcomes included Pittsburgh Sleep Quality Index, Dysfunctional Beliefs and Attitudes about Sleep Scale, 7-night sleep diary, PROMIS Depression, PROMIS Anxiety, and Health and Behavior Inventory., Results: Adolescents who received CBT-I demonstrated large and clinically significant improvements in insomnia ratings at posttreatment that were maintained at follow-up. They also reported improved sleep quality, fewer dysfunctional beliefs about sleep, better sleep efficiency, shorter sleep-onset latency, and longer sleep time compared with those with treatment as usual. There was also a modest reduction in postconcussion symptoms., Conclusion: In this pilot RCT, 6 weeks of CBT-I produced significant improvement in sleep in adolescents with persistent postconcussion symptoms. A larger trial is warranted.