PURPOSE: This systematic review identified and synthesized published research articles, written in Japanese, on the clinical effectiveness of a broad range of nonpharmacological interventions for school-age children who stutter. METHOD: A systematic review of Japanese literature published between January 1, 1980, and July 7, 2020, reporting interventions for school-age children who stutter, was carried out through a search of two databases (CiNii Article database and Japan Medical Abstract Society database) using the key words "stuttering" and "school-age" or "child" or "primary school students" or "children" or "school child" in Japanese. To be included in the review, the articles must report studies where data were subjectively reported by clinicians, where school-age participants were treated for developmental stuttering, where participants received interventions conducted by clinicians, and where quantitative outcomes (pre- and/or posttreatment) were measured; and they must be published in Japanese. RESULTS: Forty articles met all the inclusion criteria. Most articles adopted a case series or single-case study design. A total of 179 intervention programs were identified from all the articles and broadly classified into speech therapy, psychological therapy, interventions for modifying the child's environment, and others. CONCLUSIONS: Our systematic review provided a broad overview of the treatments used for school-age children who stutter in Japan. Future research should focus on gathering more reliable, systematic, and rigorous evidence to establish the effectiveness of stuttering treatments for school-age children and thereby develop evidence-based practices.