| Sinhalese, The | Nandadeva | Wijesekera | 1990 | General |
| Sinhalese-English Dictionary, A | A. Mendis | Gunasekara | 1915 | General |
| Sinharaja - A Rain Forest | Neela | de Zoysa | 1990 | General |
| Sinharaja Forest, The | Thilo | Hoffman | 1972 | General |
| Sinharaja Portrait of a Rainforest | T. S. U., Dr | de Zylva | 2010 | General |
| Sir Alexander Johnston, The Early Life of | James T., Dr | Rutnam | 1988 | General |
| Sir D.B.Jayatilaka - Biography | Nandadeva, Dr | Wijesekera | 1973 | General |
| Sir Oliver E. Goonetilleke - A Biography | Charles, Sir | Jeffries | 1969 | Politics |
| Sir Paul Pieris Felicitation Volume | N/A | N/A | 1956 | General |
| Sir Ponnambalam Arunachalam - Speeches & Writings Vol 1 | N/A | N/A | N/A | General |
| Sir Ponnambalam Ramanathan Lectures 1994, The | Lakshman | Kadirgamar | 2001 | General |
| Sir Razik Fareed | M.C.A. | Hassan | 1968 | Politics |
| Sir William Gregory - An Autobiography | Lady Gregory | N/A | 1894 | General |
| Sirimavo - Honouring the World's First Woman Prime Minister | Tissa | Jayatilaka | 2010 | Politics |
| Sirimavo Bandaranaike | Maureen | Seneviratne | 1975 | Politics |
| Sisters of The Holy Family in Sri Lanka, The | Edmund, Rt. Rev. Dr | Peiris | 1980 | Religion |
| Siva & Buddha | Sister Nivedita | N/A | 1966 | Religion |
| Six Thousand (6,000 ft) Feet Death Dive | Yasmine | Gooneratne | 1981 | Literature |
| Sixth Genre, The: Memory, History & the Tamil Diaspora Imagination (Marga 7/19) | R. | Cheran | 2001 | General |
| Sixty Four Years in Ceylon | Frederick | Lewis | 1923 | General |
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