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This systematic review and meta-analysis examined the efficacy of adolescent cognitive–behavioral sleep interventions. Searches of PubMed, PsycINFO, CENTRAL, EMBASE, and MEDLINE were performed from inception to May 1, 2016, supplemented with manual screening. Nine trials were selected (n = 357, mean age = 14.97 years; female = 61.74%). Main outcomes were subjective (sleep diary/questionnaire) and objective (actigraphy) total sleep time (TST), sleep onset latency (SOL), sleep efficiency (SE), and wake after sleep onset (WASO). There were a small number of randomized controlled trials (RCTs; n = 4) and a high risk of bias across the RCTs; therefore, within sleep condition meta-analyses were examined (n = 221). At post-intervention, subjective TST improved by 29.47 min (95% CI 17.18, 41.75), SOL by 21.44 min (95% CI −30.78, −12.11), SE by 5.34% (95% CI 2.64, 8.04), and WASO by a medium effect size [d = 0.59 (95% CI 0.36, 0.82)]. Objective SOL improved by 16.15 min (95% CI −26.13, −6.17) and SE by 2.82% (95% CI 0.58, 5.07). Global sleep quality, daytime sleepiness, depression, and anxiety also improved. Gains were generally maintained over time. Preliminary evidence suggests that adolescent cognitive–behavioral sleep interventions are effective, but further high-quality RCTs are needed. Suggestions for further research are provided.