Objectives: The aim is to evaluate the efficacy of cognitive behavioral therapy for insomnia (CBT-I) in older adults. We searched six databases to identify articles published in English or Chinese until January 30th, 2022. Methods: The two authors of the review independently selected the studies, assessed the risk of bias, and extracted the data. Fourteen studies were included. Results: Based on the results from sleep logs, a significant pooled effect size was observed for sleep efficiency (SE%) (MD = 8.36; 95% CI, 5.96–10.76; I
2
= 77%; p < .00001), sleep onset latency (SOL) (MD = −9.29; 95% CI, −13.62 to −4.96; I
2
= 64%; p < 0.0001), wake after sleep onset (WASO) (MD = −23.44; 95% CI, −32.41 to −14.47; I
2
= 85%; p < .00001), and total sleep time (TST) (MD = −12.35; 95% CI, −21.27 to −3.42; I
2
= 63%; p = 0.007). Conclusions: Our study suggests that CBT-I may be a safe and effective approach for improving insomnia in older adults.
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