Paranormal Activity 2 is a 2010 American found footage supernatural horror film directed by Tod Williams and written by Michael R. Perry, Christopher Landon and Tom Pabst. It is the second installment of the Paranormal Activity film series. The film mostly acts as a prequel to the 2007 film Paranormal Activity, beginning two months before the events depicted in the original film, although it is set over a longer period of time and eventually concludes after the first film's ending.

The film stars Sprague Grayden, Brian Boland, Molly Ephraim, Seth Ginsberg, Micah Sloat and Katie Featherston, the latter two reprising their roles as Micah and Katie from the first film. The film follows the family of Katie's sister Kristi, who start suspecting that a supernatural entity is tormenting them.

Paranormal Activity 2 was released in theaters at midnight on October 22, 2010 in the United States, the United Kingdom, Canada, Mexico, Brazil, Argentina, Poland and Ireland. It received mixed reviews from critics and was a box-office success, grossing over $177 million against a $3 million budget. An unrated version of the film was also released.