FSG

FSG can refer to:


 * Finite state grammar
 * Falling sand game
 * Fishersgate railway station, a railway station in Sussex, England
 * Fluorosilicate glass
 * Focal segmental glomerulosclerosis
 * Free Spirit Gathering, an American Pagan and Pantheist event
 * United States Federal Sentencing Guidelines

Organizations

 * Fellow of the Society of Genealogists
 * Florida State Guard, active during World War II
 * Folkestone School for Girls, in England
 * Fortress Study Group, a British historical charity
 * Free Standards Group, a defunct open-source standards organization

Businesses

 * Facility Solutions Group, an American electrical engineering company
 * Farrar, Straus and Giroux, an American book publisher
 * Fenway Sports Group, an American sports investment company
 * Flensburger Schiffbau-Gesellschaft, a German shipbuilder
 * Frontier Services Group, a Hong Kong-based, Africa-focused security, aviation, and logistics company