Big Daddy is a 1999 American comedy-drama film directed by Dennis Dugan, written by Steve Franks, Tim Herlihy, and Adam Sandler from a story conceived by Franks, and produced by Sid Ganis and Jack Giarraputo. The film stars Sandler, Joey Lauren Adams, Jon Stewart, Rob Schneider, Dylan Sprouse, Cole Sprouse, and Leslie Mann, with Allen Covert and Josh Mostel in supporting roles. The plot follows a 32-year-old man who gets dumped by his girlfriend for not accepting responsibility and then tries to be responsible by adopting a five-year-old boy who appears on his doorstep.

Produced by Giarraputo's Jack Giarraputo Productions in association with Out of the Blue... Entertainment, Big Daddy was released in the United States on June 25, 1999, by Columbia Pictures. Despite receiving mixed reviews from critics, the film was a success at the box office, grossing $235 million on a $34 million budget and becoming Sandler's highest-grosser domestically until Hotel Transylvania 2 (2015). The film was nominated for five Razzies and Sandler won the Worst Actor category.