Lf

Lf or LF may stand for:

* FlyNordic IATA airline designator
* Logical form (linguistics), a level of syntactic representation in linguistics
* Left field(er), a defensive position in baseball
* LeapFrog Enterprises, an educational toy company
* Lebanese Forces, a Lebanese political party
* Low frequency, a radio frequency between 30 and 300 kHz
* The LF (logical framework)
* Line feed, a term used in printing
* Nippon Broadcasting System, a radio station in Tokyo, Japan - JOLF
* Lactoferrin, a protein