The aim of this thesis is to explore how librarians approach to and knowledge of young people can be seen in their work methods and in activities arranged for young people. I also want to investigate other factors that librarians think can affect how they work. Five interviews were carried out with five librarians who worked with young people at public libraries. The literature review covers; young peoples needs and leisure activities, young peoples attitudes to libraries, activities arranged for them and towards departments for young people at public libraries. Literature dealing with librarians` attitudes and knowledge of young people was also included. The librarians were, on the whole, positive to young people. This was revealed in their enthusiasm in accepting the literature suggested by them and in their welcoming attitude towards them. However, experiences of "gangs" and the ways that young people used the computers came up as a problem. The librarians knew a great deal about young people, which was apparent in the wide range of literature offered, and how it was promoted. The libraries activities for young people were often focused on reading and writing projects. Other activities at the libraries were intended mainly for children. A lack of resources prevented more ambitious investments. I found that the librarians` positive approach and knowledge of young people was important to the success of activities. In order to improve marketing aimed at young people the staff at public libraries could be supported by developing methods for meeting non-users. The question of priority can also lead to an unjust distribution of resources.