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.
- http://www.herebebooks.com

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

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

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

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

Horizon Books
- Travel, voyages, exploration, natural history and gardening; rare, used, antiquarian & out-of-print books.
- http://www.horizonbook.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.
- http://havenbooks.org/

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

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