| Sunset Years | Punyakante | Wijenaike | 2004 | Literature |
| Supplement to the Sapumal Foundation Collection | de Soysa | Rohan | 2017 | General |
| Supreme Court of Sri Lanka, The - The First 185 Years | A.R.B. | Amerasinghe | 1986 | General |
| Surgeon of the Wilderness - Biography of Dr R.L.Spittel | Christine | Spittel Wilson | 2001 | General |
| Surrender or Betrayal - Sri Lanka Gives up Last King | D. B. | Kuruppu | 2003 | History |
| Survey of Environmental Legislation & Institutions in the SACEP Countries - Sri Lanka | K.H.J. | Wijayadasa | 1986 | General |
| Survey of Irrigation in Eight Asian Nations | William R. | Gasser | 1981 | General |
| Survey of Sinhala Literature, A | James, Hon | de Alwis | 1966 | Literature |
| Survey on Cost of Production of Paddy | Central Bank of Ceylon | N/A | 1969 | General |
| Survey Report on the Prevalence of illicit Small Arms in Sri Lanka | Ministry of Defence | N/A | 2008 | General |
| Surveying & Mapping in Colonial Sri Lanka | Ian J. | Barrow | 2008 | General |
| Survival & Development - Buddhist Perspective | Jotiya | Dhirasekera | 1982 | Religion |
| Sweet & Simple Kind, The | Yasmine | Gooneratne | 2006 | Literature |
| Swimming Against the Tide - An Autobiography of a Phoenix of Science | E.R. Prof | Jansz | 2012 | General |
| Sword & the Belt, The | Bertram | Serasinghe | 1984 | General |
| Sylvestro-Benedictine Monks in Sri Lanka 1845-1995 | Sylvestro Benedictines | N/A | 1995 | Religion |
| Symbols of Conflict | Cedric | Forster | 1989 | Literature |
| Systematic Nomenclature for the Birds of Sri Lanka, A | D.G.A. | Perera | 1983 | General |
| Systems Concept of Business Organization & Management Relationships, A | Y.L.R. | Jayaratne | 1995 | General |
| Tagus to Taprobane | Shihan | de Silva Jayasuriya | 2001 | History |
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