Leonardo S.p.A., formerly Leonardo-Finmeccanica and originally Finmeccanica, is an Italian multinational company specialising in aerospace, defence and security. Headquartered in Rome, Italy, the company has 180 sites worldwide. It is the 12th largest defence contractor in the world based on 2020 revenues. The company is partially owned by the Italian government, which holds 30.2% of the company's shares and is its largest shareholder.

An aerospace manufacturer is a company or individual involved in the various aspects of designing, building, testing, selling, and maintaining aircraft, aircraft parts, missiles, rockets, or spacecraft. Aerospace is a high technology industry.