Azorabooks
- Out-of-print book service specialising in new naturalists and natural history titles. Includes signed editions.
- http://www.azorabooks.co.uk

Antiquariat Daniel Good
- Offers rare books, prints, engravings, and maps. Includes owner's profile.
- http://www.danielgood.ch/

Authors & Artists
- Specializing in modern firsts, signed and limited editions, authors' early works, earth sciences, Native American, mythology and antiquarian. Includes company profile.
- http://www.aaabooks.com/

Anglophile Books
- Secondhand books; specializing in British women authors, books for Anglophiles, and Women's studies and history. Also offers a book search.
- http://www.anglophilebooks.net/

Adams Used Books
- Second-hand cross stitch patterns, books, and magazines including hard to find and out-of-print.
- http://www.adamsusedbooks.net/

Antiquariaat Vanhove
- Used and antiquarian academic books.
- http://www.antiquariaat-vanhove.com/index_en.asp

Anton W. van Bekhoven
- Books on art, architecture, art history bibliography and typography, history, philosophy, Middle Ages. Includes book lists and request form.
- http://www.antonbooks.com/

ABookLegacy
- Mostly out of print non-fiction books; Americana, genealogy, history, military, and general subjects.
- http://www.abooklegacy.com/

Arca Books
- Hard to find, out of print, used, and rare books on a variety of topics.
- http://www.arcabooks.com/

Atticus
- Used books and music.
- http://www.atticusbooks.com/

Alibris
- Used, hard-to-find, and new books.
- http://www.alibris.com/

Antiquarian Bookstore
- Used, out-of-print, rare, and antiquarian books.
- http://www.antiquarianbookstore.com/

And Books Too
- Used books; searchable and categorised.
- http://andbookstoo.com/

Asher Rare Books
- Rare books and atlases, specialties include travel and botany.
- http://www.asherbooks.com/

Attic Books
- Used and out-of-print books. Search by author, title or keyword.
- http://www.atticbooks.net/

Antiquariaat Colombine
- Titles on Amsterdam, art, philosophy; also in Dutch.
- http://www.colombine.demon.nl/

A.B.Normal Books
- Modern 1st edition and limited edition science fiction, fantasy, horror, related young adult and reference books.
- http://www.abnormalbooks.com/

Argonaut Book Shop
- California history and the American West. Other specialties include Pacific voyages, art, and Western private press books.
- http://www.argonautbookshop.com/

Antiquarian Books's Cyberstore
- A database holding the stock of a selected number of dealers; buy and sell antiquarian books.
- http://www.rarebooks.ch/

AstroLogos Books
- Reprints of hard-to-find and out-of-print books; facsimile editions of original titles in hardcover or softcover format.
- http://www.astrologos.org/

Augustine Funnell Books
- Collectible books and magazines, including mystery, horror, nonfiction, fiction, children's, Canadian.
- http://www.gusbooks.com/

Any Amount Of Books
- Rare books, first editions, modern literature, art, poetry, scholarly/academic books, antiquarian, leather bound sets, general stock.
- http://www.anyamountofbooks.com/

The Antiquarian Shop
- Specializing in rare and unusual antiquarian books, maps, and autographs in every field of interest.
- http://theantiquarianshop.com/

Antiquariat Turszynski
- Rare and valuable books from 16th to 19th century. Much of the site is in German, but English translation available for those areas.
- http://www.turszynski.de/

Aussie Books
- Australian books and out-of-print books, sorted by category and searchable.
- http://www.aussiebooks.com.au/

Antic Hay Books
- Used, rare and first edition fiction, poetry, drama and autographs.
- http://www.antichay.com/

Alfearare Rare Books
- Specializing in rare books, incunabula, manuscripts, old maps and printings; biligual, English and Italian.
- http://www.alfeararebooks.com/

Adrian Harrington
- Specialising in literature, modern first editions and bound library sets; fine and rare books in all fields. Based in London, UK.
- http://www.harringtonbooks.co.uk/