Jason Momoa enrolled in an intense six-week training program at a stunt and martial arts academy in Los Angeles for his part, while still finalizing negotiations for the film.

Jason Momoa is by his own admission afraid of horses, so all his horse riding scenes had to either be faked or filmed with doubles.

Dolph Lundgren, then Mickey Rourke, were in talks to play Corin, Conan's father, but Rourke turned it down to do Immortals (2011) before Ron Perlman was cast.

Jason Momoa and Rachel Nichols would later be offered the roles of Drax the Destroyer and Gamora in Guardians of the Galaxy (2014). Both turned the roles down, and Dave Bautista and Zoe Saldana, respectively, took them.

(at around 1h 16 mins) Rachel Nichols had a body double for her sex scene.

Ron Perlman, who plays Conan's father Corin, previously voiced Conan himself in the video game Conan (2007) and the unreleased animated film "Conan: Red Nails".

After production on the film was completed, Jason Momoa (Conan) went on to star as Khal Drogo in the first season of HBO's Game of Thrones (2011). Nonso Anozie, who played Conan's shipmate Artus, would star as Xaro Xhoan Daxos in the second season of the series.

Arnold Schwarzenegger was offered the role of Corin, Conan's father, but declined. Schwarzenegger played Conan in the original Conan the Barbarian (1982), of which this film is a reboot.

The film was originally rumored to be a remake of the original Conan the Barbarian (1982). It was revealed that the film was not a remake, but a reboot, and it had been intended to be more true to the original stories by Robert E. Howard.

Rose McGowan was the first and only choice for the role of Marique.

The ship "Hornet" is a fairly accurate replica of a seventeenth or eighteenth century Chinese junk, especially with its three square sails.

Kellan Lutz and Jared Padalecki were considered for the lead, which eventually went to Jason Momoa.

A "Conan" sequel was abandoned when this film did poorly at the box-office. In 2012 'The Legend of Conan' was announced which would have starred, Arnold Schwarzenegger, who played Conan in the original Conan the Barbarian (1982), and would have returned in the role of Conan in this direct sequel to the 1982 film. However the project ran into many issues and was canceled in 2017. Currently Netflix is developing a Conan the Barbarian live-action TV-show.

While in pre-production, Conan was a temporary title for the film, until it was changed to Conan 3D. Finally, early in December 2010, the title was changed to Conan the Barbarian, the same as the 1982 film.

Robert Rodriguez was at one point attached to direct.

The $90m budget was almost double that of the original Conan the Barbarian (1982), when adjusted for inflation (£46.6m at 2011), but recouped less than 23% of its predecessor's inflation-adjusted take during its theatrical run.

The film had spent five years in development at Warner Bros. before the rights were shifted to Nu Image/Millennium Films in 2007.

Brett Ratner was originally attached to direct before being replaced by Marcus Nispel.

Steven O'Donnell (Lucius) is known for playing Eddie Hitler's gormless friend Spudgun in the BBC sitcom Bottom (1991).

The song "Undead" by the band "Hollywood Undead" is featured in the movie's red band theatrical trailer.

Rachel Nichols, Leo Howard and Saïd Taghmaoui appeared in G.I. Joe: The Rise of Cobra (2009) as Scarlett O'Hara, young Snake Eyes and Breaker respectively.

Michael Worth read for the role of Conan.

The Mask of Acheron is named after Acheron, which in classical mythology was the river of woes and one of multiple waterways that flowed into the underworld.

(at around 57 mins) When Tamara denies that she is a descendant of Acheron's dynasty, she affirms that this family disappeared 1,000 years ago. This is not the first time that "1,000 years" are mentioned in a Conan movie. In Conan the Barbarian (1982), when Thulsa Doom talks to this disciples from his temple, he affirms that he has been alive for 1,000 years, and in Conan the Destroyer (1984) Toth-Amon says he has been waiting 1,000 years to obtain the magic crystal in order to have Dagoth's horn.

Is the second reboot featuring Rachel Nichols, who two years earlier had a scene in the Star Trek (2009). Like this reboot, both Conan and James T. Kirk are born, both Conan and Kirk's fathers are killed by the main antagonist, and Nichol's characters are both romanced by the main protagonists.