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.