| 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 |
| Sixty Years of Ceylon Cricket | S.P. | Foenander | 1924 | General |
| Siyoth - Journal of the Field Ornithology Group of Sri Lanka, Vol 1 | Malaka | Rodrigo | 2006 | General |
| Siyoth - Journal of the Field Ornithology Group of Sri Lanka, Vol 2, No 2, 2007 | Malaka | Rodrigo | 2007 | General |
| Siyoth, Journal of the Field Ornithology Group of Sri Lanka, Vol 2, No 1, 2007 | Malaka | Rodrigo | 2007 | General |
| Sketch of the Constitution of The Kandyan Kingdom, A | John, Sir | D'oyly | 1975 | History |
| Sketches From Ceylon History | H.H., Mrs | Dulling | 1933 | History |
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