| Socrate Promarex | Belgique | 3 |
| Sofia | France | 2 |
| Soft | France | 12 |
| Soft Skull Press | France | 10 |
| SoftBank Creative | Japon | 1 |
| Software Daily | | 1 |
| Sogemo | France | 9 |
| SoHo Books | Etats-Unis | 72 |
| SOIS | France | 11 |
| Sokrys | France | 9 |
| Sol y Lune | | 4 |
| Sol90 | France | 4 |
| Solal | Belgique | 1 |
| Solanhets | France | 3 |
| Solar | France | 563 |
| Solarianne | | 3 |
| Solaris | Angleterre | 80 |
| Soleil | France | 4986 |
| Soleil Noir | France | 8 |
| Solidarité Socialiste | France | 2 |
| Soline | France | 19 |
| Solveig Odland Portisch | France | 1 |
| Sombre Crapule ! | France | 1 |
| Sombres Rets | France | 14 |
| Something else | | 201 |
| Somme toute | Canada | 45 |
| Somogy | | 29 |
| Sonatine | France | 553 |
| Sonobook | France | 30 |
| Sonzogno | Italie | 5 |
| Sophene | | 1 |
| Sophia | France | 1 |
| Sophie Gramond | France | 1 |
| Sophie Quesse | | 2 |
| Soratu | France | 3 |
| Sorengo | France | 1 |
| Sort of Books | France | 16 |
| Sortilèges | France | 18 |
| SOS Homophobie | France | 2 |
| Soteca | France | 1 |
| Sotelo Blanco | Espagne | 2 |
| Souffle Court | | 3 |
| Souffle du rêve | France | 4 |
| Souffles | France | 5 |
| Souffles littéraires | France | 11 |
| Soukha | France | 4 |
| Soul Mate Publishing | | 2 |
| Soulières | Canada | 42 |
| Sound Tropez Studios | | 3 |
| Sounds True | Etats-Unis | 2 |
| Source-La Sirène | France | 8 |
| Sourcebooks | Etats-Unis | 390 |
| Souris Noire | | 4 |
| Sous la cape | France | 3 |
| Sous la lime | France | 2 |
| Sous le Sceau du Tabellion | France | 2 |
| South Dakota State Historical Society | | 2 |
| South end press | Etats-Unis | 3 |
| Souvenir Press | France | 9 |
| Spaceman project | | 21 |
| Sparkle | France | 2 |
| Sparkpress | | 10 |
| Spartorange | France | 1 |
| Spatule | France | 0 |
| SPCK | Angleterre | 2 |
| Speak | France | 94 |
| Spéciale | France | 21 |
| Spectra | Etats-Unis | 87 |
| Spectrum Literary Agency | | 3 |
| Speedernet | France | 1 |
| Spencer Hill Press | Etats-Unis | 38 |
| Spengler | | 1 |
| Sperling & Kupfer | Italie | 23 |
| Sperling Paperback | France | 16 |
| sPfc | | 9 |
| Sphere | Angleterre | 332 |
| Sphères | France | 3 |
| Spicy | France | 6 |
| Spiegel & Grau | Etats-Unis | 20 |
| Spinelle | | 54 |
| Spinifex | Australie | 3 |
| Spinsters Ink | Etats-Unis | 1 |
| Spiramus press | | 1 |
| Spiritualités vivantes | France | 4 |
| Splash | | 35 |
| Splitter | Allemagne | 13 |
| Spootnik | France | 8 |
| Spootnik / Arkantes | France | 1 |
| Sportförlaget | Suède | 2 |
| Sporting Garland Press | France | 2 |
| Spotify Audiobooks | Etats-Unis | 3 |
| Spring | Taïwan | 8 |
| Spring Books | France | 4 |
| Springer | | 6 |
| Springer-Science Business Media, B.V | Allemagne | 1 |
| Square Enix | | 143 |
| Square Fish | France | 114 |
| Square Peg | | 10 |
| ST | France | 53 |
| St Michel | France | 2 |
