Diehl Defence GmbH & Co. KG is a German weapon manufacturer headquartered in Überlingen.

It operates as a division of Diehl Stiftung and specializes in the production of missiles and ammunition.

Diehl BGT Defence was established in 2004 through the merger of Bodenseewerke Gerätetechnik GmbH and Diehl Munitionssysteme GmbH & Co. KG.

[2] In 1960, Bodenseewerke Gerätetechnik became the lead contractor for producing the American Sidewinder AIM-9B air-to-air missile in Europe.

[3] Building on the knowledge gained from the Sidewinder's infrared homing technology, Diehl Defence developed the seeker system for the IRIS-T short-range air-to-air missile.