Internationalization is becoming a more and more important feature of institutions of higher education in Spain and in Europe in general. However, it may be asked what exactly is meant by internationalization. The word often refers merely to the number of students entering or leaving a university through mobility arrangements like the well-known Erasmus programme. However, as we see it this interpretation is too limited. We believe that the concept of internationalization should refer to all the activities taking place in a university that involve contact and collaboration between people, whether they are students, academics or other staff, or between institutions that run across the physical frontiers between countries. We also see internationalization as implying that the special needs of foreign students or visiting staff are systematically taken into consideration in the activities of the University of Leon. Seen from this angle, the process of internationalization affects not just students and staff availing themselves of opportunities for mobility. It also reaches out into all the administrative and support services, the structure of syllabuses, and in general all the ways in which people teach, research or learn in our university.