There is an increasing interest in using adaptive technologies in cultural heritage field to personalize and enhance the user's visit experience. However, personalizing the cultural experience is a challenging task that requires a deep knowledge of those user's aspects that influence the visit, such as some physical, socio-cultural, and educational aspects. In other words, to be effective and to facilitate the learning process during the visit, personalized systems should consider differences between users. In this paper, we propose a user model ontology for cultural tourism applications with the aim at adapting their functionalities to the end-users' background and interests.