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- Ó Catháin, Máirtín
- Ó Drisceoil, Donal
- O’Brien, William Arctander
- O’Farrell, Mary Ann
- O'Barr, Jim
- O'Brien, Anthony
- O'Brien, David
- O'Brien, Jim
- O'Brien, Sharon
- O'Brien, Susan
- O'Brien, Susie
- O'Connell, Lisa
- O'Connell, Rachel
- O'Connor, Erin
- O'Connor, Patrick
- O'Donnell, Catherine
- O'Donnell, Mary Ann
- O'Donnell, Patrick
- O'Dougherty, Maureen
- O'Hanlon, Rosalind
- O'Hara, Daniel T.
- O'Hara, Matthew D.
- O'Mahony, Siobhan
- O'Malley, Patrick M.
- O'Meally, Robert G.
- O'Neill, Edward R.
- O'Neill, John D.
- O'Neill, Karen M.
- O'Neill, Kevin Lewis
- O'Neill, Phillip
- O'Neill, Robert M.
- O'Reilly, Kathleen
- O'Rourke, Rebecca
- O'Toole, Rachel Sarah
- Oakes, Guy
- Oakley, Francis
- Oakley, Helen
- Obando, Enrique
- Obando, Mauricio Meléndez
- Obejas, Achy
- Ober, Josiah
- Oberdeck, Kathryn J.
- Oberg, Michael Leroy
- Oberlander, Jonathan
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- Obregon, Diana
- Ochberg, Richard L.
- Ochoa Espejo, Paulina
- Ochoa, Enrique C.
- Ochoa, Marcia
- Ochs, Peter
- Odets, Walt
- Odhiambo, Tom
- Odom, William E.
- Odora Hoppers, Catherine A.
- Oehlschlaeger, Fritz
- Oetomo, Dédé
- Ofer, Dalia
- Offen, Karl H.
- Offit, Thomas
- Offord, Baden
- Offutt, Leslie S.
- Ogbar, Jeffrey O. G.
- Ogbechie, Sylvester Okwunodu
- Oglesby, Elizabeth
- Ogletree, Charles J.
- Oguibe, Olu
- Oh, Mila
- Ohi, Kevin
- Ohnuki-Tierney, Emiko
- Okada, Richard H.
- Okeke-Agulu, Chika
- Okihiro, Gary Y.
- Okma, Keike G. H.
- Okma, Kieke G. H.
- Olavarría, José
- Olcott, Jocelyn H.
- Olds, Sharon
- Olea, Raquel
- Oles, James
- Oliart, Patricia
- Olick, Jeffrey K.
- Olivares, Jorge
- Olive, Steve
- Oliveira, Flavio
- Oliver, J. Eric
- Oliver, Melvin L.
- Oliver, Paul
- Oliver, Thomas R.
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- Olivera, Mercedes
- Ollier, Maria Matilda
- Olsaretti, Alessandro
- Olsen, Patrice Elizabeth
- Olson, Joel
- Olsson, Jan
- Olupona, Jacob K.
- Olvera Gudiño, José Juan
- Olwell, Victoria
- Olwig, Karen Fog
- Omi, Michael
- Ong, Aihwa
- Ongiri, Amy
- Onkey, Lauren
- Ono, Kent
- Ono, Takamitsu
- Oppenheimer, David B.
- Oppenheimer, Gerald
- Oppenheimer, Martin
- Oquendo, Angel Ricardo
- Orenov, Vladimir
- Orenstein, Claudia
- Oreskes, Naomi
- Orfield, Gary
- Orgel, Stephen
- Orians, Carlyn E.
- Oris, Michel
- Orla-Bukowska, Annamaria
- Orlando, Valérie
- Orlie, Melissa A.
- Orloff, Ann Shola
- Orlov, Piotr
- Orovio, Helio
- Orr, Bridget
- Orr, Jackie
- Orr, Linda
- Orren, Gary
- Orrick, Allan
- Orsi, Robert A.
- Ort, Thomas
- Ortega, Francisco A.
- Ortiz, Fernando
- Ortiz, Lisa
- Ortiz, Paul
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- Ortiz, Renato
- Ortiz, Ricardo L.
- Ortmans, Jonathan
- Ortner, Sherry B.
- Orton, Fred
- Orton, Thomas J.
- Orzack, Louis H.
- Osborn, Robin
- Osborne, Michael A.
- Osborne, Peter
- Oser, Jennifer Lyn
- Osler, Sir William
- Osorio, Jonathan
- Osorio, Raul
- Osorio, Ruben
- Ossi, Massimo
- Ossman, Susan
- Oster, Corinne
- Osterweil, Ara
- Osterweil, Michal
- Ostherr, Kirsten
- Ostrom, Elinor
- Ostry, Aleck
- Otero, Carlos A.
- Ottati, Victor C.
- Ottensmeyer, David J.
- Otzoy, Irma
- Oudshoorn, Nelly
- Ouellette, Laurie
- Oushakine, Serguei Alex
- Ovalle, Priscilla Peña
- Overing, Gillian R.
- Overmyer-Velazquez, Mark
- Overmyer-Velazquez, Rebecca
- Overstreet, William
- Oviedo, José
- Owen, Paula
- Owens, Louis
- Owens, Michael Leo
- Owensby, Brian
- Oxley, Deborah
- Oyama, Susan
- Ozbudun, Ergun
- Özyürek, Esra