- 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.
- O'Shaughnessy, John - Color pictures of landscapes, animals, people, Chicago, and Ireland.
- Ogren-Hrejsa, Olivia - Featuring published and unpublished photojournalistic, landscapes, travel and sports photography
- Ohm, Tom - Small collection of images of scenic landscapes, auto racing, and family members.
- Oliphant, Forrest - Collection of photos from his early career in high school. Includes nature, mood, sky diving and social images.
- Olmos, Moses - People, objects, nature, and locations in color and black and white.
- On a Mountain - Photographs from a Blue Ridge Mountain
- 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.
- Osterversnik, Peter - Photographs of family and nature. Also, featuring electronic book reviews and information related to handheld computers.
- Oszmian, Tomasz - Features landscapes from Poland, Sweden, and France, nature, night scenes, and macro photography. Includes technical information about his equipment.
- Otsuka, Tsutomu - Display of work from free lance photographer based in Kyoto City, Japan. Gallery includes artistic nudes, travel and nature.
- Ott, Thomas - Featuring landscape, industrial, night, and portrait photography.
- Ottley, Gary - People, landscapes, cityscapes, and portraits. Some female nudes. Primarily in black and white, but some color.
- Overtoom, Willem - Dutch photographer presents his galleries of places, emotive candids, landscapes, objects and nudes.
