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The aims of this research was to find out the relation between self confidence and mathematical communication ability of junior high school students. The method that was used in this research was a quantitative research and its design was expost facto study. The subjects were 50 students of the first grade of SMP Negeri 2 Kutawaluya, Karawang. Questionnaires of self confidence and the mathematical communication test were used as the instrument for collecting the data of this research. Rank Spearman Formula was used to correlate both self confidence and mathematical communication ability. The result showed that there was a statistically significant correlation (0,40) between the self confidence and mathematical communication ability. The suggests that there is a correlation between self-confidence and mathematical communication skills.