Wise Street Books
- Specialists in used, out-of-print, scarce books on art, engineering, history, literary criticism, math, psychology, science, religion, southern, and the Civil War.
- http://www.wisestreetbooks.com/

Walter-Saxena Rare Books
- Rare, antiquarian and out-of-print books; specialize in travel, history and literature.
- http://www.walter-saxenararebooks.com/

Witherspoon Books
- A searchable site of more than 1000 out of print, scholarly and rare books, with secure online ordering.
- http://www.witherspoonbooks.com/

Wells Books
- Antiquarian and used bookstore located in Victoria, British Columbia.
- http://www.wellsbooks.com/

Wonder Book and Video
- Searchable catalog of used books.
- http://www.wonderbk.com/

Wimsey's Book Store
- Includes a searchable database of titles.
- http://www.mindspring.com/~wimsey/

William Reese Company
- First editions and manuscripts relating to Americana, travel, 18th-20th century literature and reference.
- http://www.reeseco.com/

Wolf's Head Books
- Antiquarian and used bookstore specializing in military, childrens, Floridiana, and rare books. Also offers collection development services.
- http://www.wolfsheadbooks.com/

Worldwide Antiquarian
- Rare and out of print books on the Middle East and Far East. Also deals with Arabic, Persian, Turkish, Indian, and other oriental manuscripts.
- http://worldwideantiquarian.com/

The Worlds Great Books
- Rare books and first editions in all fields.
- http://www.theworldsgreatbooks.com/

Wong Books
- Modern first editions; fiction, mysteries, sci-fi and fantasy and adventure.
- http://www.wongbooks.com/

Whitestone
- Out of print, collectible, first edition, signed and new books.
- http://www.whitestone.com/

Wessex Books
- First edition fiction and related literary criticism; academic and scholarly titles in many fields.
- http://www.wessexbooks.com/