Military
- McCulloch, Samuel, Jr.
- McDonald, Donald
- McElroy, Hugh
- McFarlin, John Green
- McFatter, Joe Harry
- McGee, James
- McGregor, John
- McHenry, John
- McKinsey, Hugh
- McKinstry, George B.
- McNeel, Sterling
- McNutt, Robert
- Medical Field Service School
- Menchaca, José Antonio [1800–79]
- Mercer, Elijah G.
- Mersfelder, Nick
- Mexía, José Antonio
- Mexican and Indian Raid of 1878
- Mexican Revolution
- Mexican Texans in the Civil War
- Mézières, Athanase de
- Military History
- Miller, Doris
- Miller, James H. C.
- Miller, William Parsons
- Montague, Daniel
- Morgan, John Day
- Morin, Raul Ralph
- Moss, James Ragsdale
- Moya, Juan
- Munguia Torres, José Rómulo
- Nathusius, Otto
- National Museum of the Pacific War
- Navarro, José Angel [The Elder]
- Neale, William
- Neill, Andrew
- Nelson, Allison
- New Regulations For Presidios
- Nimitz, Chester William
- Ninth United States Cavalry
- Noah, Samuel
- Nolan Expedition [1877]
- Nolan, Matthew
- North Fork of the Red River, Battle of the
- Nowlan, James
- Nueces, Battle of the
- Nuecestown Raid of 1875
- O'Grady, John G.
- Ochoa, Victor L.
- Oconór, Hugo
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