Background. To evaluate responses of residents to a hematology/oncology rotation.Methods. A self-administered mail survey among internal medicine residents in a university-based training program who were required to complete a hematology/oncology rotation at a comprehensive cancer center.Results. The majority of the residents rated the duration of the rotation as adequate and quality as excellent or good. It had a positive impact on certain knowledge areas, general opinion about hematology/oncology, preparation for board examination, and motivation to pursue this subspecialty, especially among residents who had performed additional electives.Conclusion. A hematology/oncology rotation received a generally positive evaluation from internal medicine residents.