This study aims to determine the effectiveness of Contextual Teaching And Learning (CTL) learning which is effective on the mathematics learning outcomes of grade VIII students of SMP Negeri 14 Buru. The method used in this study is a pre-experimental research method with a one-grop pre-test post-test design. The data used in this study were obtained from instruments in the form of learning outcomes, student activities and student responses. The sample in this study were 22 students of class VIII SMP Negeri 14 Buru. The analysis technique used in this research is descriptive analysis and inferential analysis. The results obtained in this research are that contextual teaching and learning (CTL) learning is effective on the mathematics learning outcomes of grade VIII students of SMP Negeri 14 Buru. This can be seen in the mathematics learning outcomes of students with an average score of 71.86, student activities with an average score of 3.285 are in the good category and student responses with a percentage of 77.5% with student response criteria that is positive.