SFSR (disambiguation)

SFSR may refer to:


 * A Soviet Federative Socialist Republic or Socialist Federative Soviet Republic, any of several Republics of the Soviet Union:
 * Russian Soviet Federative Socialist Republic (Russian SFSR) (1917–1991)
 * Transcaucasian Socialist Federative Soviet Republic (Transcaucasian SFSR) (1922–1936)
 * Santa Fe Southern Railway, a short line railroad in New Mexico, United States
 * San Francisco Syncope Rule, a clinical prediction rule for syncopal episodes