This research is a systematic literature review that explores current trends and various innovations aimed at enhancing students’ mathematical reasoning abilities. The purpose of this study is to map previous research developments related to mathematical reasoning and to identify gaps that remain in the existing literature. A total of 200 prior studies published in journals and conference proceedings between 2019–2024 were collected via Google Scholar using the Publish or Perish application. The data were analyzed using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) framework with the assistance of Covidence (https://www.covidence.org/). From the initial 200 studies, 149 were excluded at the title and abstract screening stage because they did not address innovations related to mathematical reasoning, while 15 others were removed due to inappropriate research designs. This left 36 studies that were examined in greater depth to identify emerging trends and forms of innovation used to improve mathematical reasoning. The majority of these studies were conducted in 2020, totaling 11 studies. Most research subjects were Grade VIII junior high school students, appearing in 12 studies. The quasi-experimental method was the most frequently applied research design, used in 23 studies. The most common form of innovation identified was the application of learning models, found in 17 studies. Other innovations included the use of varied approaches and methods, integration of information and communication technology, and the development of instructional media.