Trailer Park Boys: Don't Legalize It (also known as simply Trailer Park Boys 3) is a 2014 Canadian mockumentary crime comedy film directed by Mike Clattenburg, and based on the Canadian television series Trailer Park Boys. It is the third and final film in the Trailer Park Boys franchise, and a sequel to Trailer Park Boys: Countdown to Liquor Day (2009). In the film, Ricky (Robb Wells), Julian (John Paul Tremblay) and Bubbles (Mike Smith) attempt a series of get-rich-quick schemes, but are again pursued by Sunnyvale Trailer Park supervisor Jim Lahey (John Dunsworth). The story culminates in Ricky heading to Parliament Hill in Ottawa, where he tries to prevent the legalization of cannabis.

Clattenburg first announced plans of making a third and final film in the Trailer Park Boys Film Trilogy in May 2012. On an estimated $10 million budget, filming for Trailer Park Boys: Don't Legalize It took place on location in Halifax and Ottawa. The film marks the final appearance of series regular Richard Collins (appearing in the film as Philadelphia "Phil" Collins), who died during filming. In addition to Collins, the film is also dedicated to series regular Brian Huggins (who played Shitty Bill in the television series), and country/folk singer Rita MacNeil.

Trailer Park Boys: Don't Legalize It was released in Canada on April 18, 2014.