O

Octopus Publishing Group - Style, food, drink, maps, cartography, children's, health, antiques, reference, and educational titles by UK publisher.
www.octopus-publishing.co.uk/

OnArt Bookstore - Books in many categories, with a wide selection in Art.
www.onart.com/boo/bookstor.htm

One World Books - Selection books and e-books; emphasis on southern African authors. On-line forum for smaller publishers and self-publishers.
www.oneworldbooks.com/

Opamp Technical Books - General book store; specialties include many technical topics.
www.opamp.com/

Open Court Books - Publisher of Eastern philosophy and thought along with western philosophy and popular culture.
www.opencourtbooks.com

OSS Publishing - Specializes in health, pet and family/education-related books.
www.osspublishing.com

Ox Bow Press - An independent, scholarly publisher dedicated to both new titles and reprints.
oxbowpress.tripod.com/Index.htm

Oxmoor House Book - Publishes craft, cooking, gardening, and decorating titles.
oxmoorhouse.com