This study aims to analyze the effectiveness of STEAM-based mathematics learning on students' mathematical problem-solving abilities in Indonesia. The method used is a meta-analysis of the results of research published nationally in 2020–2025. Data is collected through a literature review using Google Scholar with the help of the Publish or Perish application. Of the 1000 articles found, as many as 20 articles met the inclusion criteria and were further analyzed. Quantitative descriptive statistical analysis was used to calculate effect size values. The results of the meta-analysis showed that STEAM-based mathematics learning had a very high influence on students' mathematical problem-solving skills, with an effect size value of 1,490. These findings suggest that STEAM integration can significantly improve students' critical thinking skills, creativity, and analytical abilities in solving math problems. The effectiveness of learning varies based on the level of education, influenced by the characteristics of the students, the readiness of implementation, learning models and media, and the approach to the development of teaching materials. The highest effectiveness was found at the elementary school level, indicating that the application of STEAM is more optimal in the early stages of mathematics education. This study emphasizes the importance of STEAM-based learning strategies in improving the quality of mathematics education and problem-solving skills of students in Indonesia.