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This study aims to analyze and examine the mathematical communication skills that are influenced by junior high school students self-efficacy on the Pythagorean theorem.The method in this study uses acorrelational method with quantitative approach.The population in this study were sudents of junior high school in Cimahi City, with a sample of 36 students who were determined by purposive sampling technique at one of junior high school in Cimahi City. The instrument used in this study is a communication ability test that consisting of 5 essays and a students- self-efficacy scale that consisting of 25 statements scales. The results showed that students communication skills in the Pythagorean theorem was positively influenced by self-efficacy of 19.1%, while 80.9% was influenced by factors other than students self-efficacy. The correlation between self-efficacy and mathematical communication skills of students is included in the medium category