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LincBook - Rare, used, out-of-print books, pamphlets and ephemera.
http://www.lincbook.com/

Loganberry Books - Used and rare books, specializing in children's and women's titles. Include a book identification service.
http://www.logan.com/loganberry/

LughnassadhBooks.com - New, used, and out-of-print books.
http://www.lughnassadhbooks.com/

Librairie Minet Frères - dealers of early printed and rare books with a preference for the Ancien Regime (in French and English).
http://www.anticbooks.com/

La Pluma Blanca - Used and out of print books.
http://asamee.bizland.com/

Lotsabooks Book Sellers - Used, out-of-print and rare books.
http://www.lotsabooks.co.nz/

Liber Antiquus - Selection of early printed books, covering a broad range of topics and disciplines.
http://www.liberantiquus.com/

Lymelight Books & Prints. - Antiquarian and secondhand books; specialities are art, geology, illustrated, literature, natural history, poetry, Topography and travel. Large general stock.
http://www.lymelight-books.demon.co.uk/

Lynge and Søn - Antiquarian booksellers; Browse by subject or search by keyword.
http://www.lynge.com/

Lucky Dog Books - Online request service for used hardbacks, paperbacks, LPs, cassettes, CDs, and videos.
http://www.luckydogbooks.com/

Louis Collins Books - Specializing in scholarly out-of-print books, especially anthropology of the world.
http://www.collinsbooks.com/

LaPointe's Used Books - General-interest store offering a wide variety of genres to choose from. Includes a search function, as well as organization by topic.
http://www.lapointesbooks.com/

Librairie Sourget - Illuminated books, manuscripts, horae, incunabula, literature, bindings and works from 15th to 19th century.
http://www.librairie-sourget.com

Lion and Phoenix Books - Rare, used, and out-of-print books; specializing in paperbacks and digests, first editions.
http://www.lpbooks.com/

Lemuria Books - Signed first editions, stock includes Southern writers, Civil War, and children's books.
http://www.lemuriabooks.com/

Little Stour Books - Offering rare, used and antiquarian books.
http://www.littlestourbooks.com/

Librairie Hatchuel - French antiquarian books on history of ideas, politics, economics, social sciences, and philosophy.
http://www.hatchuel.com/main.php?lg=2&dev=1