Great Depression
- Moursund, Walter Henrik
- Murillo, Jesus
- Museum of Fine Arts, Houston
- Nance, Joseph Milton
- National Association For the Advancement of Colored People
- National Pan American Golf Association (NPAGA)
- National Youth Administration
- Nelms, Agnese Carter
- Nelson, George T.
- Newell, Perle Potter Penfield
- Nino, Primitivo Leijo
- Norris, John Alexander
- Northrop, Joseph Walter, Jr.
- O'Daniel, Wilbert Lee [Pappy]
- O'Quinn, Trueman Edgar, Sr.
- Oberholtzer, Edison Ellsworth
- Oil and Gas Industry
- Parker, Bonnie
- Parkhouse, George Marshall
- Parsons, Lucy
- Patman, John William Wright
- Patterson, William Franklin, Jr. [Frank]
- Patton, Jackson Ingersoll [Jack]
- Payne, Ellen Evans Lewis
- Pearl Brewing Company
- Pecan-Shellers' Strike
- Perales, Alonso S.
- Pérez, Jovita
- Phillips, Bobbie Erskin
- Piney Point Village, TX
- Polk, Naomi
- Port Terminal Railroad Association
- Post Office Murals
- Prince’s Hamburgers
- Prohibition
- Ragan, Cooper Kirby
- Randolph, Frankie Carter
- Rayburn, Lucinda [Miss Lou]
- Rayburn, Samuel Taliaferro
- Red, Samuel Clark
- Reyna, Maria Torres
- Reynolds, Mary Vaughn
- Rice University
- Rice, Friendly Rudolph
- Richardson, Clifton Frederick, Sr.
- Rio Grande Compact
- Riverside General Hospital
- Robertson, Nellie Gray
- Robinson Judson Wilbur, Sr.
- Rodríguez, Dionicio