PPT Namenska (Serbian: ППТ Наменска, romanized: PPT Namenska) is a Serbian manufacturer of arms, mortars, grenade launchers, unmanned ground vehicle, hydraulics and pneumatics, airplane parts and some complex weapons system including modernized M-77 Oganj, PASARS-16, and LRSVM Morava in various stages of production.

"Prva Petoletka Trstenik" (PPT) was founded on 23 March 1949, by the Government of People's Federal Republic of Yugoslavia, at the beginning of the first five-year plan of development, after which it was named.

But Josip Tito ordered in 1949 that about 150 most advanced factories and their production to be moved from Serbia to Bosnia and Herzegovina, Croatia and Slovenia under a pretext of a Soviet invasion that never occurred.

Thus Prva Petoletka never produced a complete aircraft but only parts such as hydraulics and landing gears.

[5] Since 2008 PPT Namenska is separate legal entity and operates under government control as part of Defense industry of Serbia.