OTs-21 Malysh

{{Infobox weapon

|name=OTs-21 Malysh

| image=

| image_size =

|caption=

|origin=Russia

|type=Semi-automatic pistol

|is_ranged=yes

|service= 2006

|used_by= Russia

|wars=

|designer= Y. I. Berezin = KBP Instrument Design Bureau

|design_date= 1994

|manufacturer=Izhmash

|unit_cost=

|production_date=

|number=

|variants=OTs-21S

|spec_label=

|weight={{convert|565|g|abbr=on}} (OTs-21)
{{convert|550|g|abbr=on}} (OTs-21S)

|length={{convert|126|mm|in|abbr=on}}

|part_length=

|width={{convert|20|mm|abbr=on|1}}

|height={{convert|100|mm|abbr=on|1}}

|cartridge=9×18mm Makarov (OTs-21)
.380 ACP (9x17mm Short) (OTs-21S)

|action=Straight blowback

|rate=

|velocity=

|range= {{convert|10|m|yd|abbr=on|1}}

|max_range= {{convert|25|m|yd|abbr=on|1}}

|feed=5-round detachable box magazine

|sights=Single groove on the slide

}}

The OTs-21 Malysh ({{langx|ru|ОЦ-21 «Малыш»}}, meaning "kid") is a 9 mm semi-automatic pistol designed by the KBP Instrument Design Bureau for special applications where concealment is a key priority.

The Malysh operates on the simple blowback principle; it is a double action only design with the ammunition capacity limited to five 9×18mm Makarov rounds (can use only 57-N-181S cartridges) in a box magazine with a base extension for more comfortable holding and firing. It features an internal hammer and there are no protrusions to hinder rapid withdrawal from a pocket or holster. The pistol has no safety other than the need for a definite pressure on the trigger. There are also no sights other than a groove along the top of the slide, emphasizing the intention that the OTs-21 Malysh is limited to very short-range engagements.