Teorema, known as Theorem in the United Kingdom, is a 1968 Italian surrealist psychological drama film written and directed by Pier Paolo Pasolini and starring Silvana Mangano, Terence Stamp and Massimo Girotti, with Anne Wiazemsky, Laura Betti, Andrés José Cruz Soublette, Alfonso Gatto and Carlo De Mejo. Pasolini's sixth film, it was the first time he worked primarily with professional actors. In this film, an upper-class Milanese family is introduced to, and then abandoned by, an otherworldly man with a mysterious divine force. Themes include the timelessness of divinity and the spiritual corruption of the bourgeoisie.

Teorema has been sometimes incorrectly cited as the source for the 1986 American comedy film Down and Out in Beverly Hills; though there are similar themes, the latter is inspired by a much older stage play from around 1932. It has also inspired Bruce LaBruce's 2024 film The Visitor.