The objective of this study was to investigate the frequencies of using critical thinking in reading among university students namely; interpretation, analysis, evaluation, inference, explanation, and self-regulation. The quantitative method was used in this study. The respondents of this study were 100 second year undergraduate students of Ar-raniry State Islamic University, Banda Aceh. The data needed for the study were collected through a set of questionnaire. The data collected were analyzed quantitatively in the form of percentages. The results showed that inference was the critical thinking skill mostly about 54% of students used in reading comprehension. In addition, the next types of critical thinking skills used by students in order were analysis, explanation, evaluation, interpretation, and self-regulation. Self-regulation was the least skill about 5% of them practised by students in reading comprehension. It indicated that the frequency of using critical thinking skills among university students were more on inference level in reading comprehension.