Def

Def or DEF may refer to:

Music

 * Def (instrument), a Middle Eastern musical instrument
 * DEF II, a British youth TV programme
 * Def American, a rock and rap record label
 * Def Jam Recordings, a rap record label
 * Def Jux, a rap record label
 * Def Leppard, a British hard rock band
 * So So Def Recordings, a rap record label

Other uses

 * , a keyword in Python and PostScript
 * Danish EL-Federation, Danish trade union for electricians
 * Design Exchange Format, or DEF
 * Deutsche Emaillewaren-Fabrik, or DEF, Oskar Schindler's Enamel Factory in Kraków, Poland
 * Diesel exhaust fluid, or DEF, also known as AdBlue or AUS 32
 * Disarmed Enemy Forces, or DEF
 * Diethylformamide, an organic solvent

People with the name

 * Mos Def, a rap artist
 * Def Jef, a rap artist