JSC Kalashnikov Concern (Izhevsk Machine-Building Plant until 2013; tr. Izhevskiy mashinostroitel'nyy Zavod) or IZHMASH is a Russian defense manufacturing concern and joint-stock company headquartered in the city of Izhevsk in the Republic of Udmurtia as well as the capital city of Moscow. The concern designs and produces a wide range civilian and military weapons including assault rifles, sniper rifles, designated marksman rifles, machine guns, squad automatic weapons, hunting rifles, shotguns, guided artillery projectiles, and a wide range of other precision weapons including unmanned vehicles and military robots.

Kalashnikov Concern produces about 95% of all small arms in Russia and supplies to more than 27 countries around the world, making it the largest firearm manufacturer in Russia. Notable products include the Kalashnikov (AK) assault rifle series, the RPK light machine gun series, the Dragunov SVD semi-automatic sniper rifle, the SKS semi-automatic carbine, the Makarov PM pistol, the Saiga-12 shotgun, and the submachine guns Vityaz-SN and PP-19 Bizon. These firearms, except for the SKS and the PM, were based out of the famous AK series, due to its reliability to endure harsh conditions, low production costs unlike Western firearms, availability in nearly every geographical region, and ease of use.