The Bolivian military police that used to fight the cartel but have since made a tense truce with them.
- Elite Mooks: Since the UNIDAD forces started out as a paramilitary force, they are better armed and equipped then the average cartel grunts. In fact the basic UNIDAD soldier is as tough as the Cartel's Elite Mooks.
- Enemy Civil War: Santa Blanca may have UNIDAD on their payroll, but it's not exactly a firm truce and both sides are quite willing to shoot at each other. In addition, some random encounters have Santa Blanca sicarios being held prisoner by UNIDAD forces.
- Expy: They seem to be based off of a mixture of the UTARC, a (now disbanded) Bolivian military police unit that was infamous for its brutality and wearing black ballistic masks, the UMOPAR, a counter-narcotics unit of the Bolivian national police responsible for dealing with drug dealers in rural areasnote , and BOPE, a special unit of the Military Police of Rio de Janeiro State in Brazilnote , specifically UNIDAD's symbol, which features a knife stabbing down into a skull, which is famously the symbol of BOPE (and one of their mottos).
- Faceless Goons: Most UNIDAD soldiers wear face concealing balaclava.
- From Camouflage to Criminal: UNIDAD is a paramilitary organisation originally set up by the Bolivian government to combat drug cartels, but due to high levels of corruption inside it's ranks, it has become just an army of well-equipped thugs and bullies.
- Only Six Faces: UNIDAD officers have a limited number of face models, even though several of them take part in in-game cutscenes, which ends up giving the impression that UNIDAD is some kind of Clone Army.
- Respawning Enemies: While they are tougher than Cartel Sicarios, the biggest threat posed by UNIDAD forces is the fact that, unless they're killed in stealth, fighting them will immediately trigger a UNIDAD alert resulting in infinite waves of UNIDAD reinforcements of steadily increasing difficulty.
The Bolivian Major General in charge of UNIDAD. He brokered the deal between Santa Blanca and the Bolivian government.
- A Father to His Men: He cares for the men under his command, and after his capture, laments that the soldiers the Ghosts killed while doing so were good men.
- Anti-Villain: Baro is a genuine patriot who only made a deal with the Cartel in order to avert further bloodshed once it became clear they were too entrenched and powerful for UNIDAD to defeat. He's even been trying to act against the Cartel once it became clear the violence and brutality they're inflicting upon Bolivia is just as bad as it would be if there was open war.
- Deal with the Devil: Santa Blanca didn't try to moderate its activities after they made a deal with UNIDAD but made them much much worse.
- Morality Pet: His daughter is one to him.
- My God, What Have I Done?: Has this reaction to the Santa Blanca takeover of his country.
- Papa Wolf: His response to the Ghosts finding and forcing his daughter to call him? Set up an ambush.
- Puppet King: Despite being the commanding officer of UNIDAD, Baro has lost control of much of the organization, with many of his officers pursuing their own agenda and making deals with the Cartel, which also partially explains why UNIDAD continues to be just as hostile to you even after you succeed in forming an alliance with him.
- Worthy Opponent: Despite threatening his daughter to draw him out, then kidnapping him, the Ghosts still treat Baro with the respect due to an officer of his rank. Though this is partly due to military courtesy and partly due to the Ghosts wanting to gain his assistance against the Cartel.
"El Comandante" a.k.a. Lt. Colonel Miguel De los Montreros
A lieutenant-colonel in UNIDAD, El Comandante is a legendary soldier, working closely with Santa Blanca. He and his men are responsible for the destruction of rebel forces in the area of Media Luna and turning it into a UNIDAD stronghold. He keeps his identity a tightly-controlled secret, and wears a black ballistic mask at all times. The Ghosts face him in the "UNIDAD Conspiracy" DLC.
- Anticlimax Boss: Despite his impressive-looking armor and reputation as a legendary soldier, El Comandante isn't any tougher than any other normal boss in the game when you finally start gunning for him. Weaver even quips "Guess he wasn't as badass as he thought!" when you blow him away. The real challenge is that you have to hunt him down in the midst of a massive UNIDAD base swarming with soldiers.
- Archenemy: Is this to the rebels, having more or less defeated them by the time of the game.
- Bonus Boss: Like La Cabra, he's a DLC assassination target and not part of the game's normal main quest progression.
- Colonel Badass: How he portrays himself. He's more like a Fake Ultimate Hero, though this might simply be due to game mechanics.
- The Faceless: He's never without his black ballistic mask, even wearing it in official military documentation papers. This may be a reference to the UTARC, one of the units UNIDAD is believed to be based on, who were famous for wearing black ballistic masks.
- Enemy Mine: El Sueño does not like having a member of UNIDAD working so closely with the cartel, and would generally prefer to keep them out of cartel operations entirely. It's later revealed he was justified in his suspicions; El Comandante is actively looking for ways to disrupt or destroy Santa Blanca to take over the cocaine trade himself.
- The Evil Prince: He turns out to be the son of one of Bolivia's top leaders, having been sent down to Cartel territory to covertly usurp Santa Blanca's cocaine production infrastructure away from them.
- Malevolent Masked Man: To conceal his identity he wears a black ballistic mask with red paint on it that resembles claw marks.
A mostly defeated communist resistance against the Bolivian government that is reluctantly allied with the Ghosts. At least at first.
- Archenemy: El Commandante.
- La Cardinale is also the only cartel member who actively seems to care they exist.
- Back from the Brink: The Ghosts provide them enough war material and stolen money to become a serious threat to Santa Blanca as well as the Bolivian government as a whole.
- Becomes All for Nothing as the death of Pac Katari as well as the Bolivian government hiring the Los Extranjeros results in them being crushed again.
- Chummy Commies: They become very friendly to the Americans once they start eliminating the bosses.
- Becomes Dirty Communists after they turn on you under Pac Katari's orders.
- Enemy Mine: The rebels are willing to accept any help they can get against UNIDAD and Santa Blanca.
- Expy: One for M-19, which was a party in Columbia's war against Pablo Escobar.
- Five-Finger Discount: The majority of their supplies come from the Ghosts stealing them from Santa Blanca and UNIDAD.
- Hammer and Sickle Removed for Your Protection: They never explictly claim to be communists but their Che inspired uniform (available as an outfit) and leader's dialogue make it clear.
- Hero of Another Story: Were in a conflict with UNIDAD and the cartel well before the Ghosts were involved. It didn't work out for them.
- Odd Friendship: An anti-colonialist communist resistance is allied with a unit of American Special Forces.
- The Remnant: They were defeated by El Commandante a year before the events of the game and are reduced to a handful of fighters under Pac Katari's control.
- "Shaggy Dog" Story: Their entire revolt more or less just amounts to a footnote in the Ghost's destruction of the Santa Blanca cartel.
- Underestimating Badassery: They seem to think they can take on El Sueno's forces themselves once he's discovered. They're wrong.
- Ungrateful Bastard: A Downplayed trope example. They are very grateful and often sing your praises in ambient dialogue. They also don't hesitate to turn on you at Pac Katari's orders.
Your primary liaison with the Kataris 26 rebels, providing additional intel on specific targets and operations of the Santa Blanca.
- Bitch in Sheep's Clothing: In addition to his endgame betrayal of you, various collectible audio logs and background conversations reveal he's a much more ruthless and manipulative figure than his "heroic rebel leader" persona would suggest. It turns out he already tried to dispose of Amaru before by leaking his location to Santa Blanca (which is how Amaru ended up kidnapped at the beginning of the game), and in various conversations with the Ghosts he strongly hints at his plans to take over the cocaine trade in Bolivia despite his public propaganda broadcasts condemning Santa Blanca for their drug trade. In Ricky Sandoval's confession, it's also strongly indicated that Katari helped with the false flag bombing of the U.S. Embassy and knew all along that the Ghosts were brought to Bolivia on false pretenses.
- Chronic Backstabbing Disorder: At the end of the game, he first kills his mentor, Amaru, for being too soft and idealistic. Soon after, he betrays the Ghosts in order to kill El Sueño for himself and prove to the world that the Kataris 26 are not slaves to the American government.
- One of Ricky Sandoval's tapes reveals that Katari was the one responsible for leaking Amaru's location to Santa Blanca, which is how Amaru ended up captured at the beginning of the game in the first place. So Katari had actually been plotting to get rid of Amaru for a long time. Sandoval decides to go along with it since Amaru was extremely anti-American while Katari was more pragmatic and willing to work with the Yankees.
- Chummy Commies: Downplayed. His talk of an "Agrarian proletariat" and theories of revolution imply pretty heavily that he's some sort of Communist, and he is allied with the players. However, he openly dislikes the Ghosts and other Americans, and is only working with them to fight their mutual foe in Santa Blanca. Then, after the Ghosts destabilize the cartel and it seems that El Sueño is on his last legs, he drops the Chummy part and turns on the Ghosts.
- Foreshadowing: If enough rebel ops are successfully completed, he eventually, carefully, asks the Ghosts if they could stop destroying so much cocaine and the facilities that produce it, foreshadowing part of his real motives long before he makes an open move to that end.
- General Failure: When the Ghosts first get into Bolivia, the rebellion is fractured and on the verge of defeat. While this is understandable to a degree, given that the Kataris 26 have had to deal with the full might of both Santa Blanca and the Bolivian government coming down on them, Pac then proves to be an ineffective leader even after that. The Ghosts do the majority of the work dismantling the cartel, while Katari mostly asks for favors and complains that the Ghosts aren't working fast enough, or doing things the way he likes. The one time he is seen actually doing something, it ends in his gruesome death at the hands of El Sueño. Still, he can at least inspire people to action with his rhetoric.
- Named After Someone Famous: Named himself after famous South American indigenous anti-colonial revolutionary Tupac Katari.
- Off with His Head!: At the end of the game he turns against the Ghosts solely so he can be the one to kill El Sueño personally. For his trouble he gets his head pulled off by El Sueño with a meat hook.
- Pet the Dog: Pac's not a complete asshole, and without prompting from the Ghosts he independently sends a squad of rebels to protect La Gringa from a Santa Blanca hit squad out of gratitude for her medical help for their cause, even though by that point she had already outlived her usefulness to both the rebels and the cartel.
- Teeth-Clenched Teamwork: He's initially very reluctant to help the Ghosts, partially out of resentment that one American's death provides only four soldiers, while hundreds of his fighters died and yet they never received any support. Katari does get much friendlier if the Ghosts perform a large number of sidequests to strengthen the rebels, and he's shown to be one of the more open-minded rebels when it comes to working with the Americans, unlike Amaru and some of the other rebels who don't want anything to do with the Yankees.
- Ungrateful Bastard: Despite all of your assistance to his cause, he betrays the Ghosts in order to prove the Kataris 26 can stand on its own by killing El Sueño himself, telling you to leave the country then ordering his rebels to kill you when you chase after him and Sueño instead.
AmaruOne of the founders of the Kataris 26, whose ideas helped shape the rebellion. Your first mission upon touching down in Bolivia is to rescue him.
- Action Survivor: Though he can't fight, he's stubborn as a tree. Your rescue of him shows how he's able to survive the Santa Blanca's torture with enough spunk to mock how cringy El Polito and La Yuri's behavior was.
- Chummy Commies: Like Pac above. While he's initially much more civil towards the Ghosts than Pac, the audio logs reveal that he was completely opposed to working with Americans, while Katari was much more pragmatic and willing to work with the Yankees to achieve the rebels' objectives.
- Dropped a Bridge on Him: The mission to take El Sueno down has the Ghosts finding his dead body. It's later in the mission you learn Pac Katari killed him, feeling he was too soft for the Revolution.
- Named After Someone Famous: Took his name from Tupac Amaru, an Andean King.
- Non-Action Guy: He's an old man without a proper place on the battlefield, but nonetheless inspires the rebellion.
- Unwanted Rescue: A Downplayed Trope example but he isn't happy the Ghosts are the people to pick him up.
- We Hardly Knew Ye: Only appears in the first mission and never makes another appearance. Except as a corpse.