This paper addresses to assess the critical thinking ability of postgraduate students. The target population was the male and female students at University level in Pakistan. A small sample of 45 male and 45 female students were selected randomly from The Islamia University of Bahawalpur, Pakistan. Cornell Critical Thinking Test Series, The Cornell Class- Reasoning Test, Form X developed by Ennis (1964) were used to assess the students' critical thinking ability. SPSS version 20 was used to analyze the data. The percentage was calculated to assess the students' critical thinking ability. The t-test was used to make comparison of the students' ability on gender bases. The analysis, based on t-value, revealed an insignificant difference between the critical thinking ability of male and female students. Recommendations were furnished in order to improve the students' critical thinking skills.