Military
- Odlum, Benjamin Digby
- Olivarri, Placido
- Orozco, Pascual, Jr.
- Orsay, Henry
- Ortiz Parrilla Red River Campaign
- Ortiz Parrilla, Diego
- Oswald, Theodore
- Packsaddle Mountain Fight
- Pagès, Pierre Marie François de
- Palo Duro Canyon, Battle of
- Parker, James W.
- Parsons, Albert Richard
- Patterson, William Franklin, Jr. [Frank]
- Patton, Moses Lockhart
- Patton, William Hester
- Payne, Isaac
- Peacock Military Academy
- Peak, Junius W.
- Peña, José Enrique de la
- Peñascal Raid of 1874
- Perdomo, Oscar Francis
- Perez, Juan Ignacio
- Perry, Cicero Rufus
- Pierson, John Goodloe Warren
- Pig War
- Pizaña, Aniceto
- Plan of San Diego
- Plum Creek, Battle of
- Polignac, Camille Armand Jules Marie, Prince de
- Portilla, José Nicolás de la
- Porvenir Massacre
- Price, Albert James, Sr.
- Prisoners of War
- Quayle, William
- Racknitz, Johann von
- Ramon Expedition
- Ramos, Basilio, Jr.
- Rattlesnake Springs, Battle of
- Red River War
- Rees, John
- Remolino Raid
- Republic of the Rio Grande
- Rigaud, Antoine
- Rio Grande City Riot of 1888
- Roberts Rifles
- Robertson, Jerome Bonaparte
- Robinson, Isaac
- Robison, Joel Walter
- Robison, John Gallimore
- Rodriguez, Ambrosio
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- Boundary Disputes and Ethnic Conflict (31)
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