| Oberle, Jean | Greggie Fine Art, Atlanta, GA |
| O'Brien, Don | Don O'Brien Fine Art, Buzzards Bay, MA |
| Obuchi, Tamaki | Fraser Gallery, Washington, DC |
| Ochs, Jody | Gallery 9, Banner Elk, NC |
| O'Connor, Madeline (b.1931) | Moody Gallery, Houston, TX |
| O'Connor, Nancy (b.1957) | Moody Gallery, Houston, TX |
| O'Connor, Robert J. | Thomas Jacoby Fine Art, Cashiers, NC |
| O’Day, Kathy Mack | McBride Gallery, Annapolis, MD |
| Oeder, Georg | Tam O’Neill Fine Arts, Denver, CO |
| Offeman, Jim | Story Sloane's Gallery, Houston, TX |
| Oh, Alice | Nexus Foundation, Philadelphia, PA |
| Ojima, Masuo (ceramic) | Spectrum Galleries Fine Art, Folsom, CA |
| Ojo, Albert Jide | 11ArtsMusee, NY, NY |
| Oliver, Doug | Joan Cawley Gallery, Ltd., Scottsdale, AZ |
| Olson, Derek (woodcarving) | |
| Okamoto, Ayao | Overseas Arts, LLC, Wilmington, DE |
| O'Keeffe, Georgia | Hirschl & Adler Galleries, NY, NY Joan Cawley Gallery, Ltd., Scottsdale, AZ Nedra Matteucci Galleries, Santa Fe, NM Spanierman Gallery, NY, NY |
| O'Meallie, Sean (sculpture) | Harmony Park Gallery, Fort Collins, CO |
| Opalski, Douglas (watercolor) | |
| Orbenz, Evan | McTara Gallery, Trumansburg, NY |
| Orekhov, Lev | Russian Colours Fine Art Gallery, St. Petersburg, Russia |
| Oretsky, Barry | Rehs Gallery, New York, NY |
| Orio, Echave y (Mexico) | Arte para colleccionistas, Mexico City, Mexico |
| Orlandini, Fabrizio | Galleria D'Arte, Lucca, ITA |
| Orman, Jack (prints) | Harmony Park Gallery, Fort Collins, CO |
| Orozco, Jose Clemente (Mexico) | Arte para colleccionistas, Mexico City, Mexico |
| Orozco, Luis (Colombia) | Arte Inc. Colombia |
| Orrea, Carlos (Colombia) | Arte Inc. Colombia |
| Orsillo, Bob (photo) | Orsillo's Gallery, Nottingham, NH |
| Orsini, Myrna | Freed Gallery, Lincoln City, OR |
| Ortiz, Manuel Ángeles (Spain) | Luis Burgos Galeria De Arte, Bilbao, Spain |
| Ortuño, Roberto | Place des Arts, Paris, FRA Sala Parés, Barcelona, Spain |
| Osada, Vyacheslav (paintings) | New Images Gallery |
| Osborne, Lyndal | Horizon/Laverty Fine Art, Vancouver, CAN |
| Osipov, Sergey (Russia) | Russian Colours Fine Art Gallery, St. Petersburg, Russia |
| Osman, Mohamed Buwe Sidi | Merka Gallery, Auburn, WA |
| Osmar (Oliveros, Osmar) | |
| Ostermiller, Dan | Nedra Matteucci Galleries, Santa Fe, NM |
| Oteiza, Jorge (Spain) | Luis Burgos Galeria De Arte, Bilbao, Spain |
| Otiev, Viktor | Russian Colours Fine Art Gallery, St. Petersburg, Russia |
| Otis, George Demont | Robert Raynolds Fine Arts, Atascadero, CA |
| Otsuka, Hisashi | Tower Gallery, Sacramento, CA |
| Otterness, Tom | Marlborough, NY, NY |
| Oulton, Thérèse | Marlborough, London, UK |
| Oviedo, Ramon | Banco Central de la Republica Domenicana Casa de las Americas, La Habana, Cuba Fundacion Guayasamin, Quito, Ecuador Galeria Diaz Mancini, Caracas, Venezuela Gallery of Contemporary Art, Washington, DC La Pinacoteca, Domenican Republic Museo de Arte Moderno, Santo Domingo, Domenican Republic Museo Metropolitano de Panama, Panama Museo Nacional de Nicaragua, Nicaragua Organization of American States, Washington, DC Virginia Miller Galleries, Coral Gables, FL UNESCO, Paris, France |
| Ovchinnikov, Vladimir (Russia) | Russian Colours Fine Art Gallery, St. Petersburg, Russia |
| Owen, Claire | Nexus Foundation, Philadelphia, PA |
| Owen, Paula | Primary Objects Fallery, San Antonio, TX |
| Owen, Tom | Capricorn Galleries, Potomac, MD |
| Owens, Scott (Sculpture) |