Dirty Grandpa is a 2016 American buddy sports romantic sex comedy film about a lawyer who drives his grandfather to Florida during spring break. The film was directed by Dan Mazer and written by John Phillips. It stars Robert De Niro and Zac Efron in the leading roles, with Aubrey Plaza, Zoey Deutch, Julianne Hough and Dermot Mulroney in supporting roles. It was filmed on location in Atlanta from January 19 to May 9, 2015.

Dermot Patrick Mulroney is an American actor. He is known for his roles in romantic comedy, western, and drama films.