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Astri Oddo

Friend of Obi-Wan Kenobi and ally of the Jedi Order. She is a prominent character in the Jedi Apprentice book series, the Jedi Quest book series, and the The Last of the Jedi book series.

Barriss Offee – portrayed by Nalini Krishan

Jedi Padawan of Luminara Unduli. She was a friend of Ahsoka Tano, but betrayed her and the Jedi Order after she became disillusioned with their wartime policies and orchestrated a terrorist bombing.

Hondo Ohnaka – voiced by Jim Cummings

Leader of a gang of space pirates. Despite being a pirate, Hondo believes in honor, which influences his business transactions. He considered his capture and selling of Dooku, Obi-wan and Anakin to be "good business", even wishing to be aquantices afterwards; he did seem to be on good terms with Obi-wan later. He later helped make Boba give information to the Jedi by explaining his father Jango would do it because it's honorable. He even faced the Sith Lord Darth Maul, shooting off one of his mechanical legs. When he his men originally betrayed him to work for Maul, Hondo felt proud of them, and betrayed. He is willing to do any kind of job, in ludicrous delivering weapons, and keep his mouth shut if the price is right.

Ric Olié – portrayed by Ralph Brown

Pilots the queen's ship and an N-1 starfighter in The Phantom Menace.

Ferus Olin

Former Jedi Padawan who joined Obi-Wan Kenobi in searching for any Jedi who survived Order 66 and the subsequent Great Jedi Purge. Main protagonist of Jude Watson's The Last of the Jedi series.

Cal Omas

Politician and leader of the Galactic Federation of Free Alliances in the New Jedi Order and Legacy of the Force series.

Omega Squad

A four-man Republic Commando unit featured in the books Star Wars Republic Commando: Hard Contact and Star Wars Republic Commando: Triple Zero.

Granta Omega

The son of the Dark Jedi Xanatos who wanted revenge on the Jedi Order, blaming them for the death of his father. He became enemies with Obi-Wan Kenobi in particular, battling him multiple times. He is one of the central antagonists of the Jedi Quest book series.

Carth Onasi

Character who appears in Star Wars: Knights of the Old Republic and is referenced in Star Wars: Knights of the Old Republic II – The Sith Lords.

Onimi

Depicted throughout most of the New Jedi Order series as a "shamed one", The Unifying Force reveals that Onimi in fact controls Overload Shimrra. Jacen Solo kills Onimi in the series' final book.

Oola – portrayed by Femi Taylor

Young Twi'lek dancer enslaved by Jabba the Hutt and chained to his throne. Killed by Jabba's Rancor Monster.

Savage Opress – voiced by Clancy Brown

A warrior of the Nightbrother clan on the planet Dathomir, Darth Maul's brother alongside Feral. He is hand picked by Asajj Ventress as part of her scheme to kill Count Dooku for the attempt on her life and is altered by the Nightsisters, becoming more of a berserker on Ventress' call to the point of killing Feral without remorse, Opress manages to become Dooku's new apprentice and learns only a bit in the ways of the Sith before Ventress has him help her fight Dooku due to his actions under him getting unwanted attention from the Jedi. However, in the heat of the moment and provoked by both of them, Opress tries to kill both Dooku and Ventress before escaping the Jedi and instructed by Mother Talzin to find Maul so he can complete his training to defend himself against the numerous enemies he made. Finding Maul a shell of his former self on a junk planet, Opress manages to stir up his brother's grudge with Obi-Won to aid him in his revenge against the Jedi.

Canderous Ordo - voiced by John Cygan

Mandalorian warrior who fought in the Mandalorian Wars. Later becomes ruler of Mandalore under the name "Mandalore the Preserver". Playable character in both Star Wars: Knights of the Old Republic and Knights of the Old Republic II – The Sith Lords.

Bail Prestor Organa – portrayed by Jimmy Smits

Leia Organa's adoptive father. He is the Senator of Alderaan and one of the Rebel Alliance's founding members. He was killed in the destruction of Alderaan. Adrian Dunbar portrayed Organa for scenes cut from The Phantom Menace. Smits voiced the character for The Force Unleashed, as well as the animated series The Clone Wars.

Queen Breha Organa – portrayed by Rebecca Jackson Mendoza

Ruler of Alderaan, wife of Bail Organa, and adoptive mother of Leia Organa.

Princess Leia Organa – portrayed by Carrie Fisher

Luke Skywalker's sister and Han Solo's wife. Leader in the Rebel Alliance and the New Republic.

Orrin

a male Neimoidian ally of the CIS during the Clone Wars.

Jan Ors – voiced and played by Angela Harry (Jedi Knight), Julie Eccles (voice, Dark Forces), Vanessa Marshall (voice, Jedi Outcast)

Kyle Katarn's pilot and love interest.

General Otto – voiced by Tom Kane

Imperial officer who deserted the Empire. First appears in the game Star Wars: Demolition and appears later in Star Wars Galaxies.

Admiral Kendal Ozzel – portrayed by Michael Sheard

Initial commander of Darth Vader's Super Star Destroyer Executor in The Empire Strikes Back. Vader kills Ozzel for his incompetence. George Lucas remarked that Sheard produced "the best screen death" he'd seen.