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Harold Doan - Used, out-of-print, rare and antiquarian books. Searchable index of inventory.
h-doan.tripod.com/

Haven Books - A general used, rare and out-of-print bookstore; hardcover books with an emphasis on non-fiction, including antiques, military, railroad and aviation. Based in Winter Haven, Florida.
havenbooks.org/

Haymes and Sons - Catalogue includes art, architecture, travel, exploration, military, natural history, sport, theology, fashion, theater.
www.haymes.com/

Henry Hollander, Bookseller - Antiquarian and scholarly bookstore specializing in Judaica.
www.hollanderbooks.com/

Here Be Books - Full-service used bookstore. Used, rare, and out-of-print books and collectible roleplaying games (RPGs): hard cover and paperback. Search service. Brodart book covers.
www.herebebooks.com

Heritage Books - Rare and hard-to-find books in many categories; also ephemera.
www.heritagebks.com/

Hidden Staircase - New collectible and out-of-print books, as well as gift items.
www.hiddenstaircase.com/

High Ridge Books - Antiquarian and used books.
www.highridgebooks.com/

Hillside Books - Books on insects and related topics.
www.insects.demon.co.uk/

Horizon Books - Travel, voyages, exploration, natural history and gardening; rare, used, antiquarian and out-of-print books.
www.horizonbook.com/