Pirates of the Caribbean: On Stranger Tides is a 2011 adventure fantasy film and the fourth installment in the Pirates of the Caribbean series. Gore Verbinski, who had directed the three previous films, was replaced by Rob Marshall, while Jerry Bruckheimer again served as producer.

In the film, which draws inspiration from the novel On Stranger Tides by Tim Powers, Captain Jack Sparrow (Johnny Depp) is joined by Angelica (Penélope Cruz) in his search for the Fountain of Youth, confronting the infamous pirate Blackbeard (Ian McShane). The film was distributed by Walt Disney Pictures, and had its theatrical debut in release dates falling within May 18 and May 20, 2011. The release was presented in Disney Digital 3-D and IMAX 3D, as well as in traditional two-dimensional and IMAX formats.

Writers Terry Rossio and Ted Elliott first learned of Powers' novel during the back-to-back production of Dead Man's Chest and At World's End, and considered it a good starting point for a new movie in the series. Pre-production started after the end of the 2007–2008 Writers Guild of America strike, with Johnny Depp collaborating with the writers on the story design. Principal photography rolled for 106 days between June and November 2010, with locations in Hawaii, the United Kingdom, Puerto Rico, and California, and used 3D cameras similar to those used in the production of the 2009 film Avatar. Ten companies were involved with the film's visual effects.

On Stranger Tides broke many box office records upon release, and it stands as the 8th highest-grossing film of all time worldwide. Critical reviews were mixed, with praise to the acting, directing and visuals, but criticism over the script-writing, excessiveness, and lack of originality.