The purpose of this study was to describe the amount of congruence in the perceptions of 38 matched nurse-patient dyads concerning the nurse's role in patient education. The perceptions of nurses and patients from two hospital settings were measured with two complementary sets of questions, developed for this study; t-tests were used to compare the mean responses of nurses and patients within and between the two settings to each set of complementary questions. The results indicated that incongruencies existed between nurses' and patients' perceptions of the nurse's role in patient education. Patients identified a general teaching function for nurses. When asked who they preferred to have teach them the specific information related to their condition, patients most frequently chose a physician. Nurses most frequently chose a nurse as the current and most desired patient teacher. Nurses incorrectly assumed that the desires of their patients for patient education were similar to their own. The results suggest that nurses need to develop a clear definition of their role in patient education, to validate patients' desires for teaching, and to examine organizational factors influencing their performance of the patient teaching role.