Alenia may refer to:
Companies Alenia Aermacchi, an Italian aeronautics company, founded in 2012 Alenia Aeronautica, a former Italian aeronautics company, founded in 1990 and merged into Alenia Aermacchi
Alenia Marconi Systems, a former Anglo-Italian defence electronics company Alenia Spazio, an Italian aerospace company (now Thales Alenia Space)
Other uses Alenia (butterfly), a genus of skippers in the family Hesperiidae