This study was done with the aim of identifying the Mathematical Literacy Level of students from 8 grades of Secondary School and examining the correlation between mathematical literacy and mathematical success. It also explored how much the effect of the mathematical literacy level of secondary school students on their mathematical success is. Within this framework, the study was designed as correlational survey model. In the questionnaire of the study, there were 334 students from 8 grades of secondary school. “Mathematical Literacy Scale” and “Mathematical Success Test” were used for getting research data. As a result of data analysis, it was determined that mathematical literacy level of secondary school students were, in general, midlevel. When considered the sub-dimension of mathematical literacy scale, it was confirmed that the dimensions of the correlation, research and comment were midlevel. While the discovery-proof level was low, the visiualty dimension was high level. In terms of the relation between mathematical literacy and mathematical success, there was a positive high level relation. This situation can be interpreted as mathematical literacy is important for mathematical success of the students. When the predictive level of mathematical literacy for mathematical success was examined, it was seen that mathematical literacy expressed 73% of mathematical success. So it can be concluded that the level of mathematical literacy is an important factor for Mathematical Success, and In line with the results, if students correlate between the situations, produce different data and use these data, they can be successful in maths.