Ogre, Yoko
- Tokyo based digital illustrator.
- http://www.ogre-s.com/

Ogline, Tim
- Specializing in digital scratchboard illustrations.
- http://www.theispot.com/artist/ogline/

Orris, Sandra
- Examples of illustrations of biological subjects are shown done in pen and ink, colored pencil, watercolor and scratchboard.
- http://orrisarts.com

Orvidas, Ken
- Stylized conceptual illustrations using paint and collage.
- http://www.orvidas.com/

Oakley, Jacqui
- Freelance illustrator based in Toronto, Canada, showcases her traditional media portraits and conceptual artworks.
- http://www.jacquioakley.com

Oskamp, Nils
- Representative artwork from advertising icons to editorial illustration by this artist based in Hamburg, Germany.
- http://www.oskamp.de/

O'Brien, James
- Children's and editorial digital illustration specialist.
- http://www.obrienart.com/

Ogle, Mary
- Gentle and colorful illustrations for childrens' books, advertising and web design.
- http://www.maryostudio.com/