This study aims to determine whether there is an effect of Contextual Teaching and Learning approach on students' mathematics learning outcomes. The type of research used in this research is quantitative research, with a post-test only control design. The study was conducted at Mts Al-Azhar Center Baturaja with a population of all seventh grade students. The sample in this study used cluster random sampling, so that class VII.D as the experimental class would be given treatment, namely the Contextual Teaching and Learning approach and class VII.I as the control class that was not treated. Research data were collected through tests. Based on the results of test analysis, it shows that students' mathematics learning outcomes change from each meeting. The statistical calculation obtained from the test results produces