Kongsberg Defence & Aerospace (KDA) is one of three business units of Kongsberg Gruppen (KONGSBERG) of Norway and a supplier of defence and space related systems and products, mainly anti-ship missiles, military communications, and command and weapons control systems for naval vessels and air-defence applications. Today, the company is probably best known abroad for its development/industrialisation and production of the first passive IR homing anti-ship missile of the western world, the Penguin, starting delivery in the early 1970s. As of 2021, Kongsberg Defence & Aerospace had 3,500 employees.

Kongsberg Gruppen is an international technology group headquartered in Norway, that supplies high-technology systems to customers in the merchant marine, defence, aerospace, offshore oil and gas industries, and renewable and utilities industries.