Director Orson Callan Krennic is a fictional character in the Star Wars franchise, portrayed by Australian actor Ben Mendelsohn in the film Rogue One (2016) as the main antagonist, as well as in season 2 of the prequel series Andor (2025). Krennic is the Director of Advanced Weapons Research for the Galactic Empire.

Industrial Light & Magic chief creative officer John Knoll, credited for the story of the 2016 film Rogue One, told Vanity Fair in 2016 that he conceived the plot of the film while working as a visual effects supervisor on the 2005 film Star Wars: Episode III – Revenge of the Sith. Hearing about the development of a live-action Star Wars television series, he conceived a story, inspired by a plot point mentioned in the opening crawl of the original 1977 film Star Wars, which would eventually become Rogue One. In Knoll's original story draft of the film, Krennic was a double agent on Jyn Erso's team reporting to the Imperial Security Bureau. However, this was changed when Gary Whitta came aboard to write the script. Earlier planned endings for the film featured Krennic surviving the events on Scarif before being killed by Darth Vader for not preventing the Rebel Alliance's theft of the plans to the Death Star. The scene was cut as writers had trouble justifying how Krennic would have survived the explosion the Death Star caused.

In March 2015, it was announced that Ben Mendelsohn had been cast in a lead role in Rogue One. Mendelsohn said in an interview he learned about his casting while filming Bloodline, having dinner in a restaurant with director Gareth Edwards, "He [Edwards] told me about the story and he told me about the character and then he said, 'I want you to do it.'" Mendelsohn noted his response was immediate.

The character of Orson Krennic is depicted as a power-hungry and ruthless Imperial weapons developer overseeing the construction of the Death Star, a space station with the capability to destroy an entire planet. Krennic has a rivalry with Grand Moff Tarkin, and seeks to win the favor of Emperor Palpatine.

James Luceno, author of the novel Catalyst: A Rogue One Novel which introduced Krennic, has said, "Orson Krennic prides himself in being able to get his way through manipulation and whatever devilish things he can come up with. He also has the ability to stay on his feet even when punches are being hurled at him. He can change strategies in the middle of things. This, combined with his innate volatility, makes him a very different kind of villain than we've seen".

In an interview with Collider, Mendelsohn spoke of his character, saying "He's an outsider, essentially. He's an outsider in so far as he's not a born officer class guy, he's a guy that worked his way up and regards a lot of the officer class as just not really worth their salt. And he is a guy that as it were has come up through stuff, so he has a great force of will, he also very much believes in the Empire's agenda, he's very onboard with it. He's risen his way up to become the head of military intelligence and operations and he's going to build this Death Star".

Krennic first appears in the 2016 prequel novel Catalyst: A Rogue One Novel by James Luceno. A Lieutenant Commander, later Commander, in the Galactic Republic Special Weapons group, he rescues his old friend Galen Erso, a scientist who has been kidnapped with his family by Separatist agents. Following the formation of the Empire, Krennic manipulates Galen to work on the Death Star project. The novel also explains how Krennic's interrogation of Poggle the Lesser, a character introduced in Attack of the Clones, kickstarted the Empire's Death Star Project.

Rogue One: A Star Wars Story was released in December 2016, featuring Ben Mendelsohn in the role of Orson Krennic. In the beginning of the film, he captures Galen Erso to force him to continue helping the Empire build the Death Star. Over a decade later, Krennic meets with Grand Moff Tarkin, who expresses skepticism about his management of the Death Star project. When the Death Star is completed, Krennic tests its superlaser on the capital city of Jedha upon Tarkin's request, killing Rebel extremist Saw Gerrera and his Partisans. Once Krennic has proven the station's power, the imperious Tarkin uses a recent security leak as a pretext to wrest control of the weapon away from him. A furious Krennic travels to Eadu to confront Galen and his team of engineers, whom he believes may be responsible for the leak. After Galen confesses, he is mortally wounded during a Rebel attack and Krennic flees. He later meets with Darth Vader on Mustafar, seeking an audience with Palpatine and to regain command of the Death Star, but is Force-choked and dismissed to ensure there are no further security breaches related to the Death Star project. Krennic goes to Scarif as the Rebels engage Imperial forces there, and sends his Death Trooper guards into battle while he attempts to stop the Rebels from stealing the Death Star plans hidden in the Scarif Imperial facility. Krennic shoots and wounds Cassian Andor, and later tries to kill Jyn Erso, but Andor recovers and shoots Krennic, incapacitating him. Krennic is subsequently killed by the superlaser of the Death Star when it fires on Scarif at Tarkin's order.