Twins (rendered in its title sequence logo as TWiiNS) is a 1988 American buddy comedy film directed and produced by Ivan Reitman. The film is about unlikely fraternal twin brothers (Arnold Schwarzenegger and Danny DeVito) who were separated at birth. The core of the film is the contrast between the streetwise Vincent (DeVito) and the intelligent but naive Julius (Schwarzenegger). The film marked the first collaboration for Reitman and Schwarzenegger.

The film was a commercial success, grossing $216 million worldwide. Instead of taking their usual salaries for the film, Schwarzenegger, DeVito and Reitman agreed with the studio to take collectively 40% of the film's box office and rental returns; this resulted in them receiving the biggest paychecks of their film careers.