Alien 2: On Earth, also known as Alien Terror, is a 1980 Italian science fiction horror film, written and directed by Ciro Ippolito before the trademark Alien was registered. It was released following the success of the 1979 film Alien as an unofficial sequel, albeit having no connection to the film.

The film features a score by Guido De Angelis and Maurizio De Angelis, performed by the composers under the pseudonym Oliver Onions. The film co-starred a young Michele Soavi, years before he became an Italian horror film director, and a cameo appearance by Ciro Ippolito (in the role of "Joe"). It was filmed in California, the Cinecittà studios in Rome, and in the Castellana Caves.