FSU

FSU may refer to:


 * Florida State University, a large public research university in Tallahassee, Florida
 * Ferris State University, Michigan
 * Frostburg State University, Maryland
 * Fayetteville State University, North Carolina
 * Fairmont State University, West Virginia
 * Fitchburg State University, Massachusetts
 * Framingham State University, Massachusetts
 * Friends Stand United, street gang
 * Finance Sector Union, Australian trade union
 * Financial Services Union, Irish trade union
 * Fédération Syndicale Unitaire, French trade union
 * Former Soviet Union, collective term for the fifteen countries that formed the Soviet Union until 1991
 * Fuse-Switch-Unit, opposite of SFU, relating to the order an electrical fuse is inserted in a circuit