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American Artists
- O'BOURKE, Terina
- O'BRADY, Gertrude
- O'BRIEN, James Francis
- O'DONOHOE, Margaret
- O'DONOVAN, Ella Markley
- O'DONOVAN, William Rufolf
- O'HAGAN, John L.
- O'HARA, Eliot
- O'HARA, James Frederick
- O'HARA, Tom
- O'HEARN, Robert
- O'KANE (Info Only)
- O'KANE, Helen Marguerite
- O'KEEFE, Neil
- O'KEEFF, Neil (Info Only)
- O'KEEFFE, Georgia
- O'KELLEY, Mattie Lou
- O'KELLY, Aloysius
- O'LEARY, Angela
- O'LEARY, Galbraith
- O'LEARY, John (Info Only)
- O'MALLEY, Power
- O'MALLEY, Power (Power O'Malley, Michael Augustin)
- O'MEILIA (0'MELIA), Philip Jay
- O'MFILIA, Philip Jay
- O'NEAL, William Bainter (Info Only)
- O'NEIL, John
- O'NEILL (WILSON), Rose Cecil
- O'NEILL, John J.
- O'NEILL, John Patton
- O'SHAUGHNESSY, Thomas A. (Info Only)
- O'SHEA, John
- O'SHEAN, Sean
- O'TOOLE, Cathal Brendan
- O;DONOHOE, Margaret
- OAKES, William Larry (Info Only)
- OAKLEY, Thornton
- OAKLEY, Violet
- OBEL, Nils
- OBERG, Ralph E.
- OBERHARDT, William
- OBERTEUFFER, George
- OBLINSKI, Rafal (Info Only)
- OCHAGAVIA, Carlos
- OCHS, Phil (Info Only)
- OCHTMAN, Leonard
- OCHTMAN, Mina Fonda
- ODELL, Lad
- ODELL, Thomas Jefferson
- ODEN, Clytie (Info Only)
- ODETS, Clifford
- ODOM, Mel
- OECHSLI, Kelly (Info Only)
- OEHLER, Berenice Olivia (Info Only)
- OELBAUM, Zeva (Info Only)
- OELSCHIG, Augusta D.
- OERTEL, Johannes Adam Simon
- OF, George Ferdinand
- OGDEN, C. (Possibly Carol) B.
- OGDEN, Henry (Harry) Alexander
- OGDEN, Henry Alexander (Harry)
- OGDEN, Henry P. (Info Only)
- OGDEN, Lyman Garfield (Info Only)
- OGG, Oscar (Info Only)
- OGILVIE, John Clinton
- OGLE, Richard (Info Only)
- OGLE, Richard B.
- OHARE, Joseph Francis (Info Only)
- OHLSON, Douglas Dean
- OHLSSON, Ib (Info Only)
- OKAMURA, Arthur
- OKON, Mejo (Info Only)
- OLBINSKI, J. (Josef?) Rafal
- OLDEN, George (Info Only)
- OLDENBURG, Claes Thure
- OLDFIELD, Helen Regina Clark
- OLDFIELD, Otis William
- OLDMAN, Jean (Info Only)
- OLDS, Elizabeth
- OLDS, Sara Whitney (Info Only)
- OLENCHAK, Thomas Richard (Info Only)
- OLESEN, Olaf (Info Only)
- OLINSKY, Ivan Grégorévitch
- OLINSKY, Tosca
- OLITZSKY, Jules
- OLIVEIRA, Nathan
- OLIVER, Joanne
- OLIVER, Juan
- OLIVER, Louise (Beehe) (Info Only)
- OLIVER, Myron Angelo
- OLIVER, Thomas Clarkson
- OLMES, Mildred Young
- OLSEN, Albert Byron
- OLSEN, Harry Emil
- OLSEN, Herbert Vincent
- OLSEN, Vivian
- OLSHAUSEN-SCHONBERGER, Kathe (Dombrovaki)
- OLSON, Albert Byron
- OLSON, Charles R.
- OLSON, Henry William
- OLSON, J. Olaf
- OLSTOWSKI, Franciszek (Info Only)
- OLTAR JEWSKY, W.K. (Info Only)
- OLUGEBEFOLA, Ademola
- OMAN, Edwin L. (Info Only)
- ONAGA, Yoshimatsu
- ONDERDONK, Julian
- ONDERDONK, Robert Jenkins
- ONGLEY, William
- ONSLOW-FORD, Gordon
- OPAZO, Rodolfo
- OPERTI, Albert Jasper Ludwig Roccabigliera
- OPPENHEIM, Dennis A.
- OPPENHEIM, Samuel Edmund (Info Only)
- OPPER, Frederick Burr
- OPPER, John
- ORBAAN, Albert F. (Info Only)
- ORD, Joseph Biays
- ORDE, Gertrude Cederstrom (Info Only)
- ORDWAY, Alfred T.
- ORLOFF, Gergory (Info Only)
- ORLOWSKY, Lillian
- ORMES, Zelda
- ORNSTEIN, Jacob Arthurs
- ORR, Alfred Everitt
- ORR, Carey
- ORR, Eric
- ORR, Forrest Walker
- ORR, Frances Morris
- ORR, Joe Charles
- ORR, Louis
- ORR, Martha (Info Only)
- ORR, Veronica
- ORTH, John William
- ORTIZ, Angel
- ORTIZ, Errol
- ORTIZ, Jose Luis
- ORTLIP, Aileen (Shea)
- ORTLIP, Aimee E.
- ORTMAN, George Earle
- ORTMAN, George Earle
- ORVILLE, Peets Houghton
- OSBORN, Robert Chesley
- OSBORNE, Addis (Info Only)
- OSGOOD, Harry Haviland
- OSHIVER, Harry James
- OSNIS, Benedict A.
- OSNIS, Daisy Hartman
- OSSORIO, Alfonso Angel (Info Only)
- OSTENDORF, Arthur Lloyd JR (Info Only)
- OSTERMAYER, Ed
- OSTHAUS, Edmund Henry
- OSTRENGA, Leo Raymond (Info Only)
- OSTROWSKY, Abbo
- OSTROWSKY, Sam
- OSTUNI, Peter W.
- OSVER, Arthur
- OSWALD, Tony
- OTERO, Aileen (Info Only)
- OTIS, Bass
- OTIS, George Demont
- OTIS, Jeff
- OTIS, Samuel Davis (Info Only)
- OTMAN, J. (Info Only)
- OTNES, Fred
- OTT, E. L.
- OTT, Ralph Chelsey
- OTTE, William Louis
- OTTENDORF, E. Pollick
- OTTER, Thomas P.
- OTTESEN, Frederick Lund
- OTTINGER, George Morton
- OTTINGER, Kenneth
- OTTMAN, Chic W.
- OTTO, Walt
- OURDAN, Joseph Propser (Info Only)
- OURDAN, Joseph Prosper (Info Only)
- OUREN, Karl
- OURLICHT, Laurie
- OUSLEY, Will
- OUTCAULT, Richard Felton
- OVERBECK, Hannah Borgen
- OVERBECK, Margaret
- OVEREND, William Heysman
- OVERPECK, Ray
- OVERSTREET, Anne Aller
- OWEN, Bill
- OWEN, Frank Edward (Info Only)
- OWEN, Franklin Charles
- OWEN, Frederick L.
- OWEN, Michael G. JR (Info Only)
- OWEN, Robert Emmett
- OWENS, Charles (Info Only)
- OWENS, Charles A.
- OWENS, John
- OWENS, Maude Irwin (Info Only)
- OZENFONT, Amedee
Artists' Signatures 
