The aim of this study was to investigate the awareness of oral potentially malignant disorders (OPMD) and oral cancer among medical and dental students of the University of Peradeniya. A pre-tested, self-administered questionnaire was used among 1006 students. Majority were medical students (74.3%), females (60.5%), and in the second year (25.2%). About 54% of respondents had poor knowledge. Dental students had a significantly higher knowledge and female students showed greater awareness. About 90% of medical students had never examined a patient with OPMD, and 79.5% of them had not examined one with oral cancer. Medical undergraduates must receive adequate education about OPMD and cancer.