Oprea, Maia Stefana
- Gallery of contemporary works includes drawings, paintings and photography.
- http://maia-fine-art.com/

One of a Kind Creations
- Artwork painted in acrylic or oil on slate or canvas, or with watercolor on paper (matted).
- http://www.oneofakindcreations.com/

Ogg, Stuart
- Flower and landscape photographs and paintings of the River Thames area near Oxford England.
- http://www.stuartoggart.co.uk/

Oppenheimer, Martin
- Gallery of charcoal drawings, oil paintings, wood and bronze sculpture, and mixed media artwork. Site provides artist’s biography and articles on artistic techniques.
- http://www.oppenheimerart.com/

Olson, Shirley LaRee
- Figurative sculpture in bronze and paper clay, landscape paintings in acrylic, oil, or watercolor, prints and note cards.
- http://www.olsonart.com/

The Oiseaux Sisters
- Artwork of the Oiseaux Sisters, Susan Andrews and Carolyn Fellman. It features one of a kind mixed media art work.
- http://www.oiseauxsisters.com

Olsen, Barbara
- Collages and prints for sale by American artist.
- http://www.barbaraolsen.com/

O'Connell, Brendan
- New York artist creates abstract paintings and photo-based paintings. This site provides virtual galleries of the artist's work, a chat room forum on contemporary arts and online ordering.
- http://www.brendanoconnell.com/

Orsillo, Bob
- Offers limited and open editions works. Information about the artist, image galleries of works, press releases.
- http://www.orsillo.com/

Ocampo, Octavio
- Art prints. Must see them to need them. Retail and wholesale. Framed or double matted in a variety of sizes.
- http://www.questionmark.net

Owens, Nate
- Humorous western art, paintings, prints, greeting cards, mugs and gift products. Commercial illustration and design.
- http://nateowens.com/

Olson, George
- Architect and Old World pen and ink artist.
- http://www.olsongalleries.com