FSN may refer to: fsn (file manager), a 3-D file manager that appeared in the movie Jurassic Park Fate/stay night, a visual novel Feature Story News, an international broadcast news agency Federal State of Novorossiya, a separatist entity in eastern Ukraine Federal Stock Number, a defunct codification system used by the United States federal government Federation of Student Nationalists, the student wing of the Scottish National Party Fjölbrautaskóli Snæfellinga, an Icelandic high school (menntaskóli) located in Grundarfjörður FN Five-seven, a Belgian pistol Fox Sports Networks, an American television network Fox Sports News (Australia), an Australian television channel Fox Sports North, the former name of an American regional sports network by Fox Sports Networks Full Service Network, an American telecommunications company Fu's subcutaneous needle National Social Front (Italian: ), an Italian political party National Salvation Front (Romania) (Romanian: ), a defunct Romanian political party