Government reports and investigations state that an increasing number of students are in need of additional support in upper secondary school. The Upper Secondary Education Inquiry from 2015 states that everyone in the school is responsible for supporting students in need of special support. School librarians therefore have a responsibility to support these students. However, the education in library and information science do not provide librarians with any knowledge about pedagogical work for students with disabilities. The purpose of this thesis is therefore to investigate which competencies are important in school librarians' pedagogical work for high school students with disabilities, how they have been acquired and which competencies they consider to be lacking and want to develop. To answer the questions, five school librarians were interviewed. The interviews were coded and then divided into themes. The results were analyzed using Ellström's definition of competence, skills development and Goleman's theories of emotional intelligence. The study concluded that important competencies in relation to pedagogical work for students with disabilities constitute: technical competencies, reading level competence, pedagogical competence and competence about how interact with students and educators. All competencies also include personal and social competencies that are interdependent. The informants have acquired their skills through both informal and formal measures. They feel that they lack diagnosis-related competence and special educational competence. They also want more practical experience.