The Missouri Association of School Librarians (MASL) is the premier professional organization for library media specialists who work in Missouri schools. 
The purpose of MASL is:

• To advocate for access to school library media center services and resources for Missouri’s children.
• To develop collaborative relationships with stakeholders in the educational community.
• To enable the use of information technologies in Missouri schools.
• To provide opportunities for continuing professional education, focusing on exemplary practices in school library media centers.
• To recognize significant contributions to the profession and to the improvement of school library media programs in Missouri.