47 Ronin is a 2013 American historical fantasy action film directed by Carl Rinsch in his sole theatrical directorial effort.

Written by Chris Morgan and Hossein Amini from a story conceived by Morgan and Walter Hamada, the film is a work of Chūshingura ("The Treasury of Loyal Retainers"), a fictionalized account of the forty-seven rōnin, a real-life group of masterless samurai in 18th-century Japan who avenged the death of their daimyō Asano Naganori by battling his rival Kira Yoshinaka.

Starring Keanu Reeves in the lead role along with Hiroyuki Sanada, Tadanobu Asano, Rinko Kikuchi and Ko Shibasaki, the film bears little resemblance to its historical basis compared to previous adaptations, and instead serves as a stylized interpretation set "in a world of witches and giants.

In late-medieval Japan, Kai is a half-Japanese and half-English outcast, a boy lost in the woods near Wakkanai, who gets adopted by Lord Asano, the benevolent ruler of the Akō Domain.

For the entertainment of the Shōgun, Kira arranges a duel between his best warrior, a golem, and Asano's chosen combatant, whom Mizuki incapacitates with magic.

Having realized that Kira used sorcery to frame Asano, Oishi and his son Chikara reunite the scattered rōnin, and rescue Kai from the fighting pits of the Dutch colony of Dejima.

Faced with an illusion of his men being slaughtered by the Tengu, Oishi resists the urge to draw his sword, while Kai bests his former master.

They plan to ambush Kira on his pilgrimage to a shrine to seek blessings for his wedding to Mika, but the procession is a trap and most of the rōnin are killed.

Oishi and Kai, having survived the attack, lead half the remaining rōnin to infiltrate Kira's castle, disguised as a band of wedding performers.

"[19][20] Reshoots were done in London in late August 2012, which were delayed by the 2012 Summer Olympics and the filming of Reeves' directorial debut, Man of Tai Chi.

[27] The evening tabloid newspaper Nikkan Gendai reported that its dismal performance were "unheard-of numbers" generated by the Japanese distaste for a Hollywood rendition of Chūshingura which bore little resemblance to the renowned historical epic.

[28] In the United States, the film grossed $20.6 million in five days after its release on Christmas Day 2013, opening in ninth place and facing heavy competition from Frozen, The Hobbit: The Desolation of Smaug, Anchorman 2: The Legend Continues, The Wolf of Wall Street, American Hustle, Saving Mr. Banks, The Secret Life of Walter Mitty and The Hunger Games: Catching Fire.

[30][31] 47 Ronin received predominantly negative reviews from film critics, failing to impress Japanese audiences where studio expectations were high.

The critical consensus reads: "47 Ronin is a surprisingly dull fantasy adventure, one that leaves its talented international cast stranded within one dimensional roles.