The aim of this research is to examine the relationship between secondary school students' critical thinking levels and their attitudes towards reading. Descriptive and relational scanning models were used together in the research. The population of the research is secondary school students in Mardin. The sample of the research consists of 426 secondary school students. Stratified sampling method was used while the sample was determined. Critical Thinking and Reading Attitude scales were used as data collection tools. Descriptive statistics, multivariate variance analysis, correlation analysis and linear regression analysis were used in the analysis of the data. The results of the quantitative data indicated that critical thinking skills of secondary school students are at a medium level, and their attitudes towards reading are high. Significant difference is obtained in favour of female students from critical thinking levels, and there is no significant difference in terms of gender variable in attitude towards reading, critical thinking levels in terms of classroom level variable. Similarly, there is no significant difference in attitudes, and there was a low level of relationship between critical thinking levels and their attitudes towards reading. Moreover, critical thinking level predicted the attitude towards reading significantly.