- Sacred Spaces - Selection of books and products related to a group of authors.
- Sam Weller's Zion Bookstore - New, used and rare titles. Includes a newsletter and regional picks.
- Sands Publishing - Fiction and nonfiction books in most genres, including general, suspense, romance, mystery, sci-fi, children's, spiritual, and memoirs.
- Sapna - Showroom for books located in Bangalore - India.
- Savage Press - Selection of books on a variety of subjects.
- Schiffer Books - Titles on antiques and collectibles, military collectibles and history.
- Seaview Press - Self-published books, mostly from Australia and around the world. Includes details of the self-publishing process.
- SeekBooks Australia - Large catalog by subject.
- Self Help Guides - Easy to use, and professionally written guides on many topics.
- Shakespeare and Company - Online bookstore selling books in all categories.
- Sidney T. Black Publishing, Inc. - Fiction and non-fiction by political activist David Truskoff. Includes biographical information about author.
- Siso Books - Publishers of books related to religious, epics, computer, tales, dictionaries, grammar, classics; both in English and Malalyalam languages.
- Sleeping Bear Press - Golf, children's, turfgrass management, health and nature.
- Sociosights Press - Featuring "Katherine Stinson: The Flying Schoolgirl," a biography of an aviatrix.
- Stackpole Books - Publishing books on fly fishing, nature, outdoor sports, crafts and hobbies, history, civil war, and military reference since 1927.
- Student Book World - New textbooks in categories - or search.
- Substance Books - Links book sales to authors.
- Sunstone Press - General interest books as well as non-fiction books featuring the American Southwest.
