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- Sadeepa Publishers
- Saknada Publications
- Sameera Prakashana
- Samudra Publishers
- Samudra Weththasinghe Prakashana
- Sandeshaya Prakashana
- Sanhida Prakashakayo
- Sankha Publishers
- Santhawa Prakashana
- Sanu Publishers
- Sarasavi Publishers
- Sarasa Mart
- Sayura Prakashana
- Self Published
- Silika Prakashana
- Silika Publication
- Sithuwili Publications
- Sith Ahasa
- Sooriya Publishers
- SSA-සමාජ විද්යාඥයන්ගේ සංගමය
- Storyflix (PVT)Ltd
- Subavi Publishers
- Suba Prakashakayo
- Sumithra Rahubadda Publishers
- Susara Publishers
- S & T Group