This study is based on the mathematical communication ability and mathematical dispositions of students which are still deemed insufficient. One innovation in mathematics learning that can help improve mathematical communication skills and mathematical dispositions mastery is a realistic mathematics education approach with a group investigation strategy that focuses on students’ involvement actively and it is associated with daily life in the overall learning activities. The sample in the study was the fifth-grade student of SDN 2 Ciwaru and SDN 1 Sumberjaya in Ciwaru Sub-District, Kuningan Regency. The results showed that a realistic mathematics education approach with group investigation and conventional learning strategies gave a significant effect on students' mathematical communication ability and mathematical dispositions, there were significant differences between realistic mathematics education approaches with a group investigation strategies and conventional learning in improving students' mathematical communication skills and mathematical dispositions, and there is no significant relationship between students' mathematical communication skills and mathematical dispositions using the realistic mathematics education approach with a group investigation strategy.
                        
                        
                        
                        
                            
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