O'Brien, Saoire
- Self-taught photographer uses traditional techniques to capture the personality of his subjects, human and inanimate. Includes galleries, statement, and curriculum vitae.
- http://iolfree.ie/~photographicgalleryofsaoireobrien/

Onishchenko, Vadim
- Israeli photographer offers wildlife and sports photographs, as well as photographs of the Jewish, Christian, and Muslim religious communities in Israel, mainly in color. English and Russian.
- http://www.wildlife-photo.org/

O'Shaughnessy, John
- Color pictures of landscapes, animals, people, Chicago, and Ireland.
- http://homepage.eircom.net/~johnoshaughnessy/

Ouvarov, Ilia
- Straight and digitally manipulated photographs. Includes self-portraits, still life, and images of his New York surroundings.
- http://www.uvarov.com/

Ohm, Tom
- Small collection of images of scenic landscapes, auto racing, and family members.
- http://www.creativephotosite.com/

Ott, Thomas
- Featuring landscape, industrial, night, and portrait photography.
- http://www.sixthworld.com/

Overtoom, Willem
- Dutch photographer presents his galleries of places, emotive candids, landscapes, objects and nudes.
- http://www.image-in-image.com/

Oszmian, Tomasz
- Features landscapes from Poland, Sweden, and France, nature, night scenes, and macro photography. Includes technical information about his equipment.
- http://www.home.sol.se/umbert/

Osterversnik, Peter
- Photographs of family and nature. Also, featuring electronic book reviews and information related to handheld computers.
- http://www.ojster.com/

Oliphant, Forrest
- Collection of photos from his early career in high school. Includes nature, mood, sky diving and social images.
- http://www.unc.edu/~phuzo/photo/

Olmos, Moses
- People, objects, nature, and locations in color and black and white.
- http://www.mosesolmos.com/