Feinwerkbau /ˈfaɪnwɜːrkbaʊ/, often abbreviated FWB, is a German manufacturer of firearms and air guns aimed mainly at competitive ISSF shooting events, including some contested at the Olympic Games as governed by the International Shooting Sport Federation (ISSF).

The company currently offers three distinct product lines: air pistols and rifles, small caliber .177 and .22 lr rifles and competition pistols as well as two muzzleloading black powder smallarms, chambered in .36 and .44.

It also offers several accessories, an archery trigger release and high-precision industrial machining and manufacturing services.

Because of post-war sanctions, there were few opportunities to develop small arms in Germany during the 1950s and so the fledgling company spent its first decade concentrating on the manufacture of precision parts and machines (particularly electro-mechanical calculators).

In the late 1950s they returned to their original design focus with the development of the first truly successful recoilless target air rifle (an area which was excluded from the weapon manufacturing restrictions but which could tap into the undiminished German interest in target shooting).