EFSS may refer to:
Enterprise file synchronization and sharing (enterprise file sync and share), software to securely share documents Edgefield Secondary School, Punggol, Singapore M327 Expeditionary Fire Support System (mortar), see List of crew-served weapons of the U.S. Armed Forces M1163 Expeditionary Fire Support System (jeep), see List of currently active United States military land vehicles LAV Expeditionary Fire Support System (armored car), see List of vehicles of the United States Marine Corps
See also
EFS (disambiguation)