The Union of High School Students of Serbia (UNSS) is a youth organization, founded in December 2003, with the aim of creating an organization that will represent high school students at the national and European level. Developing and strengthening the network of student parliaments in Serbia is a priority of the organization during all the years of work. The idea of ​​UNSS is to give high school students the opportunity to be informed, educated and affirmed, developing in different directions through cooperation with their peers and involvement in different projects.