L9

L9 may refer to :
* Teamline Air IATA code,
* HMS L9, a British L class submarine
* L9 Bar Mine, a large rectangular British anti-tank landmine
* Motorola SLVR L9, a cell phone
* L9A1 51 mm Light Mortar
* ninth line of the Barcelona Metro
* an internal designation for the D.II German fighter aircraft