The aim of this study is to examine the relationship between parental involvement and students' academic achievement using meta-analysis method. In the research, Proquest Digital Dissertations, Web of Science, ERIC, Council of Higher Education Thesis Center and Turkish Academic Network and Information Center were scanned, and 53 studies in accordance with the study criteria were included in the meta-analysis. Inclusion criteria includes research on the relationship between parental involvement and academic achievement, having sufficient quantitative data such as correlation value or regression coefficient, studies involving primary, secondary or high school students and their families. The correlation values of the included studies were converted into Fisher z values. The average effect size was evaluated by Comprehensive Meta Analysis V3 (CMA) Program. As a result of the study, it was seen that parental involvement affects academic achievement. In addition, it was observed that the relationship between parental involvement and academic achievement did not differ significantly according to course areas, school levels and geographical areas. In this context, suggestions have been developed for ensuring parental involvement and for future researches.