Montbau is a neighborhood in the Horta-Guinardó district of the city of Barcelona, Catalonia, Spain. In the eastern part of the neighborhood there is the campus Mundet, which had been the old Llars Mundet that was a charitable organization. In the campus there is the School of Psychology and pedagogy of the University of Barcelona, a geriatric home and schools. In the western part there is the Hospital Universitari Vall d'Hebron.