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Objective: Evaluate the effectiveness of pre-surgical orthopedics (PSO) in patients with cleft lip palate (CLP) in maxillary morphology (MM), facial growth and development (FGD), occlusal alterations (OA), parental satisfaction (PS), and side effects., Design: Systematic review and meta-analysis of randomized and controlled clinical trials. Searches was performed in CENTRAL, MEDLINE, and EMBASE., Results: From the eight studies included, three are randomized clinical trials, and five clinical trials are controlled. MM was evaluated by the intercanine width (Mean difference (MD) =1.44; CI95%= -0.30, 3.19; very low certainty), anteroposterior length (MD=1.32; CI95%= -0.59, 3.24; very low certainty) and intertuberocity width (MD=0.09; CI95%= -0.68, 0.49; certainty: very low). FGD was evaluated by SNA angle (MD: 1.29; P = 0.306; moderate certainty), SNB angle (MD: -0.79; P = 0.550; moderate certainty) and ANB angle (MD: 1; P = 0.362; moderate certainty). OA was evaluated by 5-years-old-index (MD= -0.09; P = 0.49; moderate certainty) and by Huddart score (MD=0.51; P = 0.736; moderate certainty). A valid questionnaire assessed PS only in one study (MD= -0.1; P = 0.199; moderate certainty). No studies reported side effects., Conclusion: Due to the uncertainty of the effect of PSO on MM and the lack of clinically relevant effect on FGD, OA, or PS, it is not reasonable to include this intervention as a treatment until future studies clarify its effect., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this paper., (Copyright © 2022 Elsevier Masson SAS. All rights reserved.)