A crew-served weapon or is any weapon system that requires a crew of more than one individual to function at optimum efficiency due to its operational complexity, such as requiring one person to load while another fires. The weight and bulk of the system often also necessitates multiple personnel for transportation. Crew served weapons operated by infantry include medium machine guns, heavy machine guns, automatic grenade launchers, mortars with calibers less than 120 mm (4.72 inches), anti-tank guns, anti-aircraft guns, recoilless rifles, shoulder-launched missile weapons, and static anti-tank and anti-aircraft missiles.
These weapons were chiefly used as infantry support weapons.
Many of these weapon systems can also be mounted on wheeled or tracked vehicles.