- Sagarmatha
- Samsara
- Secret Jardin
- Secret Smoke
- Seed Stockers
- Seeds Of Life
- Seedsman
- Sensi Seeds
- Serious Seeds
- Shortstuff Seedbank
- Sicce
- Sipcam Jardin
- Smok
- Solar Brother
- Soma Seeds
- Soparco
- Spanish Seeds
- Speedgrow
- Spliff Seeds
- Spongepot
- Stal & Plast
- Stash Bags
- Storm
- Strain Hunters
- Subcool's The Dank, previously TGA Seeds
- Sumo Seeds
- Sunmaster
- Sunon
- Super Grinder Original
- Super Strains
- Sweet Seeds
- Sylvania
- Séptima Generación
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