FS, fS or fs may refer to:
Fußballsportverein Frankfurt 1899 e.V., commonly known as simply FSV Frankfurt, is a German association football club based in the Bornheim district of Frankfurt am Main, Hesse and founded in 1899. The club plays in the shadow of larger and much more successful Eintracht Frankfurt.
The fstab (or file systems table) file is a system configuration file commonly found at /etc/fstab on Unix and Unix-like computer systems.
The FSV Bayreuth is a German association football club from the city of Bayreuth, Bavaria.
Free Software Foundation (FSF) grants two annual awards. Since 1998, FSF has granted the award for Advancement of Free Software and since 2005, also the Free Software Award for Projects of Social Benefit.
FS Metta is a Latvian football club located in Riga, Ķekava. As of 2012 they play in the Latvian Higher League.
FSV Zwickau is a German association football club located in Zwickau, Saxony. Today's club claims as part of its complex heritage sides that were East Germany's first champions: 1948 Ostzone winners SG Planitz and 1950 DDR-Oberliga champions ZSG Horch Zwickau.
ETR 500 (Elettro Treno Rapido 500) is a family of Italian high-speed trains introduced in 1993.
The system utility fsck (for "file system consistency check") is a tool for checking the consistency of a file system in Unix and Unix-like operating systems, such as Linux and OS X.