All authors

• Oakley, Ann
• Oberschall, Anthony R.
• Odum, Howard Washington
• Offe, Claus
• Ogburn, William Fielding
• Ohlin, E. Lloyd
• Oppenheimer, Franz
• Ortega y Gasset, José
• Ossowski, Stanisław
• Ostrogorski, Moisei
• Pakulski, Jan
• Pareto, Vilfredo
• Park, Robert E.
• Parsons, Talcott
• Patterson, Orlando
• Piven, Frances Fox
• Plekhanov, Georgi V.
• Plummer, Kenneth
• Polanyi, Karl
• Popper, Karl Raimund