Marconi may refer to:

• Guglielmo Marconi (1874–1937), an Italian electrical engineer
• Marconi Stallions, a Sydney football club

Corporations:

• Marconi Company, founded by Guglielmo Marconi. Absorbed into English Electric in 1946, which in turn was purchased by GEC in 1968 and used as the focus of its defence businesses.
  • Marconi Electronic Systems or GEC-Marconi, defence arm of GEC, sold to British Aerospace in 1999 to form BAE Systems
• Marconi plc, name adopted by GEC in 1999, now a part of Ericsson.
• Alenia Marconi Systems, a former British-Italian defence electronics company, now split between the BAE Systems and Finmeccanica.
• Matra Marconi Space, a former Franco-British aerospace company, now part of Astrium.

Marconi