PP-91

PP-91 may refer to:
* PP-91 Kedr, the base model PP-91 chambered in 9x18mm Makarov
* PP-91-01 Kedr-B, a special variant of the PP-91 fitted with a PP-91-01 Kedr-B 9x18PM sound suppressor
* PP-9 Klin, an improved variant of the PP-91 featuring an increased rate of fire and the ability to fire the 9x18mm PMM PstM gzh round.