Opera (also released as Terror at the Opera) is a 1987 Italian giallo film directed and co-written by Dario Argento and starring Cristina Marsillach, Urbano Barberini, Daria Nicolodi, and Ian Charleson. The film's plot focuses on a young soprano (Marsillach) who becomes involved in a series of murders being committed inside an opera house by a masked assailant. The film features music composed and performed by Brian Eno, Claudio Simonetti, and Bill Wyman.

Released in Italy in December 1987, Opera was a commercial success, grossing 4.737 billion lire. The film failed to receive theatrical release in most other countries, though it did receive minor regional theatrical engagements in the United States in 1990, after Orion Pictures dropped the film from a planned American distribution.