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This research aims to describe the students’ mathematical thinking based on their mathematics self-concept. There are four indicators of mathematical thinking which is used in this study. First, Specializing, i.e. trying the problem by looking at the example, paying attention to a simple case. Second, Generalising, i.e. looking for patterns and relationships. Third, Conjecturing, i.e. predicting relationships and results. Fourth, Convincing, i.e. finding and communicating the reason why something is right. This research used a descriptive method. The population of this study is all senior high school students in Subang, West Java. Instruments in this research are test of mathematical thinking ability and mathematics self-concept questionnaire (MSC). Based on the results of the research, generally, students who have positive mathematics self-concept, will have good mathematical thinking abilities. However, on the transformation material, there was a phenomenon in which students with negative mathematics self-concept had higher mathematical thinking skills compared to students whose mathematics self-concept was positive. This happens because there are some students who are not confident with their own abilities. Whereas  there is a differences in the statistics descriptive, these differences are not significant. Nevertheless, the knowledge of the description of these two variables can serve as a good enough reference for developing a model of learning for students with such characteristics.

mathematics self-concept, mathematical thinking