| Siad |
| Siam Inter Books |
| Sian B. Claven |
| Siana Éditions |
| Sibling Press |
| Sibling Rivalry Press |
| Sibyl's Scriptorium |
| SIC |
| Sichuan Science and Technology Publishing House |
| Sick Puppy Press |
| Sid Harta Publishers |
| Side Quest Publishing |
| Side Real Press |
| Side x Side Publishing |
| Sidecar Preservation Society |
| Sidecar Press |
| Sideshow |
| Sideshow Press |
| Sidgwick & Jackson |
| Sidney J. Marshall |
| Sidney L. James |
| Sidney L. Ollif |
| Sidney Shiv |
| Sidney Style |
| Sidney Wainwright |
| Sieben Stäbe |
| Siena Publishing Corp. |
| Sierra Club Books |
| Sierra Club Books / Alfred A. Knopf |
| Sierra Club Books / Random House |
| Sierra Dean |
| Sigel Press |
| Sigillum Publishers |
| Siglo Veintiuno Argentina |
| Siglo XXI de España |
| Sigma Software |
| Sigmund Brouwer |
| Sign of the Celtic Cross Press |
| Signal |
| Signal (Germany) |
| Signal 8 Press |
| Signal Hill |
| Signalman Publishing |
| Signature |
| Signature Books |
| Signature Edition |
| Signatuur |
| Signet |
| Signet / Macmillan-New American Library |
| Signet / NEL |
| Signet / New American Library |
| Signet / New American Library / SFBC |
| Signet / New American Library of Canada |
| Signet / Penguin |
| Signet / SFBC |
| Signet Classic / New American Library |
| Signet Classics |
| Signet Classics / Penguin Books |
| Signet Creed |
| Signet Eclipse |
| Signet Eclipse / SFBC |
| Signet Key / New American Library |
| Signet Key Book / New American Library of Canada |
| Signet Science Library / New American Library of Canada |
| Signet Select / New American Library |
| Signet UK |
| Signet Vista / New American Library |
| Signum |
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| Signum Bardia Publications |
| Signum Books |
| Sijthoff |
| Silas Post |
| Silence in the Library |
| Silencian Scribe |
| Silent Hill Press |
| Silent Motorist Media |
| Silent Partner Publishing |
| SilentBelle |
| Silente |
| Silhouette |
| Silhouette Bombshell |
| Silk Label Books |
| Silk Pagoda |
| Silk Raven Associates |
| Silk Road Media |
| Silkhaven Publishing |
| Silkroad Agency |
| Silkworm Books |
| Silly Hat Books |
| Silly Linguistics |
| Silman-James Press |
| Silver Age Books |
| Silver Arrow Books / William Morrow |
| Silver Bark Books |
| Silver Bullet Audio |
| Silver Burdett Company |
| Silver Burdett Ginn |
| Silver Burdett Press |
| Silver Canyon Press |
| Silver Dawn Media |
| Silver Dolphin Books |
| Silver Dragon / Regal Crest |
| Silver Dragon Books |
| Silver Dragon Ink |
| Silver Empire |
| Silver Hawk |
| Silver Heart Books |
| Silver Impala Press |
| Silver Knight Publishing |
| Silver Labs Press |
| Silver Lake Publishing |
| Silver Leaf / Himalaya Publishing |
| Silver Leaf Books |
| Silver Linings Media, LLC |
| Silver Lion Publishing |
| Silver Moon Erotica |
| Silver Pencil Books |
| Silver Pine Publishing |
| Silver Press |
| Silver Publishing |
| Silver Quill Publishing |
| Silver Salamander Press |
| Silver Scarab Press |
| Silver Script Media, LLC |
| Silver Shamrock Publishing |
| Silver Shell Books |
| Silver Spider Books |
| Silver Springs Library |
| Silver Sun Press |
| Silver Wheel Publishing |
| Silver Whistle / Harcourt |
| Silver Wing Press |
| Silver, Burdett and Company |
| Silverberry Press |
| Silverfish |
| SilverHart Publishing |
| SilverHouse Books |
| Silvern Press |
| SilverOak |
| Silvertail Books |
| Silverthought Press |
| Silverton Agency |
| Silverton Agency and Blackstone Publishing |
| SilverWell Publishing |
| SilverWood Books |
| Silverwood Press |
| Simba Reproductions |
| Simba Reproductions & Stygian Isle Press |
| Simbolo |
| Simco Press |
| Simetria FC & F |
| Simetria Portugal |
| Simi Press |
| Simian Publishing |
| Simms and McIntyre |
| Simon & Brown |
| Simon & Schuster |
| Simon & Schuster (Australia) |
| Simon & Schuster / BCE |
| Simon & Schuster / BOMC |
| Simon & Schuster / QPBC |
| Simon & Schuster / SFBC |
| Simon & Schuster Audio |
| Simon & Schuster Audio and Blackstone Publishing |
| Simon & Schuster Audio UK |
| Simon & Schuster Audioworks |
| Simon & Schuster Books for Young Readers |
| Simon & Schuster Books for Young Readers / SFBC |
| Simon & Schuster Canada |
| Simon & Schuster Children's Books |
| Simon & Schuster Children's UK |
| Simon & Schuster Export |
| Simon & Schuster India |
| Simon & Schuster Libros en Español |
| Simon & Schuster Paperbacks |
| Simon & Schuster UK |
| Simon & Schuster Young Books |
| Simon & Son |
| Simon 451 / Simon & Schuster |
| Simon Archer |
| Simon Boutreux |
| Simon Cheshire |
| Simon Clark |
| Simon Curtis |
| Simon de la Rouviere |
| Simon Finch |
| Simon G. Gosden |
| Simon Hawke |
| Simon Haynes |
| Simon Petrie |
| Simon Pulse |
| Simon Pulse / Beyond Words Publishing |
| Simon Pulse / Emily Bestler Books |
| Simon Pulse / SFBC |
| Simon Pulse / Simon & Schuster UK |
| Simon Pulse/Mercury Ink |
| Simon Rose |
| Simon Says |
| Simon Scribbles |
| Simon Spotlight |
| Simon Spotlight Entertainment |
| Simon Spotlight Entertainment / SFBC |
| Simon Spotlight/Nickelodeon |
| Simon Wady |
| Simon Williams |
| Simone Pond |
| Simone Press |
| Simonelli Editore |
| Simpkin & Marshall |
| Simpkin and Marshall |
| Simpkin, Marshall |
| Simpkin, Marshall & Co. |
| Simpkin, Marshall, and Co |
| Simpkin, Marshall, Hamilton, Kent & Co. |
| Simpkin, Marshall, Hamilton, Kent & Co. / "Sunrise" Publishing Co. |
| Simple Truths |
| Simplified Speling Sosieti |
| Simply Read Books |
| Simply Shifters |
| Simply Sophisticated Publishing |
| SimplyShifters.com |
| Simulacrum: The Magazine of Speculative Transformation |
| Simulated Publications |
| Simulations Publications |
| Sinclair Tousey |
| Sinclair-Stevenson |
| Sinful Press |
| Sinful Romance |
| Singing Reed Pr |
| Singing Tree Media |
| Singingwood Press |
| Single Player Books |
| Singularity & Co. |
| Sinister Grin Press |
| Sinister Horror Company |
| Sinister Press |
| Sinister Regard |
| Sinister Saints Press |
| Sinister Smile Press |
| Sinister Stoat Press |
| Siobhan Davis |
| SIPE |
| Sir Angels |
| Sir Hugo Books |
| Siren Press |
| Siren Publishing |
| Siren-BookStrand |
| Sirens Call Publications |
| Sirius |
| Sirius / Angus & Robertson |
| Sirius / Arcturus Publishing |
| Sirius en Siderius |
| Sirius Fiction |
| Sirius Press |
| Sirius Science Fiction |
| Sirmio |
| Sironi Editore |
| Siruela |
| Sisley's |
| Sisters Price Publishing |
| SISU |
| Sisu Publications |
| SITESA |
| Sitio de Ciencia Ficción |
| Sitnalta Press |
| Sittin' on a Goldmine Productions LLC |
| Sivullinen |
| Six Continents Communications |
| Six Foot Press |
| Six Gallery Press |
| Six Gate Publishing |
| Six Hens Press |
| Six Minutes to Midnight |
| Six Star Tree Publications |
| Six Talon Sign Fantasy & Futuristic Romance |
| Six Wolves Press |
| Six Worlds Publishing |
| Six-String Books |
| Sixpence Publishing |
| Sixth Element Publishing |
| Sixth Finch Books |
| Sixth Moon Press |
| Sixth Moon Publishing |
| Sixth Street Press |
| Siygrah Books |
| Size 5 1/2 B Publishing |
| Sizzler |
| Sizzler / Renaissance E Books |
| Sizzler Editions |
| Sizzling Lizard Press |
| Sizzling Romance Publishing |
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