Leonardo is an Italian company active in the fields of defense, aerospace, and security. Its largest shareholder is the Italian Ministry of Economy and Finance, which holds approximately 30% of the shares.

From 1948 until 2016, it was known as Finmeccanica; it changed its name to Leonardo-Finmeccanica in April 2016 and subsequently adopted its current corporate name on January 1, 2017. As of January 1, 2016, the activities of the previously controlled companies AgustaWestland, Alenia Aermacchi, Selex ES, OTO Melara, and Wass were merged into Leonardo-Finmeccanica.

Leonardo is the twelfth largest defense company in the world and the largest in the European Union by size, with defense sector revenues representing 68% of its turnover. The company is listed on the FTSE MIB index of the Milan Stock Exchange. The company is structured into five operating divisions: helicopters, aircraft, aerostructures, electronics, and cyber security (formerly security and information systems).