To evaluate the effectiveness of ICU rounding checklists on outcomes. Five electronic databases (MEDLINE, Embase, CINAHL, Cochrane Library, and Google Scholar) were searched from inception to May 10, 2024. Cohort studies, case-control studies, and randomized controlled trials comparing the use of rounding checklists to no checklists were included. Other article types were excluded. The primary outcome was in-hospital mortality. Secondary outcomes included ICU and 30-day mortality; hospital and ICU length of stay (LOS); duration of mechanical ventilation; and frequency of catheter-associated urinary tract infections, central line-associated bloodstream infections (CLABSI), and ventilator-associated pneumonia. Additional outcomes included healthcare provider perceptions of checklists. Pooled estimates were obtained using an inverse-variance random-effects meta-analysis model. Certainty of evidence was evaluated using Grading of Recommendations Assessment, Development, and Evaluation. There were 30 included studies (including > 32,000 patients) in the review. Using an ICU rounding checklist was associated with reduced in-hospital mortality (risk ratio [RR] 0.80; 95% CI, 0.70-0.92; 12 observational studies; 17,269 patients; I2 = 48%; very low certainty of evidence). The use of an ICU rounding checklist was also associated with reduced ICU mortality (8 observational studies, p = 0.006), 30-day mortality (2 observational studies, p < 0.001), hospital LOS (11 observational studies, p = 0.02), catheter-associated urinary tract infections (CAUTI) (6 observational studies, p = 0.01), and CLABSI (6 observational studies, p = 0.02). Otherwise, there were no significant differences with using ICU rounding checklists on other patient-related outcomes. Healthcare providers' perceptions of checklists were generally positive. The use of an ICU rounding checklist may improve in-hospital mortality, as well as other important patient-related outcomes. However, well-designed randomized studies are necessary to increase the certainty of evidence and determine which elements should be included in an ICU rounding checklist.