The ZU-23-2 "Sergey", also known as ZU-23, is a Soviet towed 23 mm anti-aircraft twin-barreled autocannon. ZU stands for Zenitnaya Ustanovka (Russian: Зенитная Установка) - anti-aircraft mount. The GRAU index is 2A13.
The ZU-23-2 was developed in the late 1950s. It was designed to engage low-flying targets at a range of 2.5 km as well as armoured vehicles at a range of two kilometres (km) and for direct defense of troops and strategic locations against air assault usually conducted by helicopters and low-flying airplanes. In 1955, KBP presented the single-barrel ZU-1 and the twin-barrel ZU-14. While the former was eventually dropped, the ZU-14 was selected and, after some modifications, entered series production.
In the Soviet Union, some 140,000 units were produced. The ZU-23 has also been produced under license by Bulgaria, Poland, Egypt and the People's Republic of China.
Development of this weapon into a self-propelled anti-aircraft gun (SPAAG) led to the ZSU-23-4 Shilka.
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