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| Society, State & Religion in Premodern Sri Lanka | Amaradasa | Liyanagamage | 2001 | Religion |
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| Socio-Economic & Other Factors Affecting the Teaching of English in Sri Lanka | Sri Lanka Foundation Institute | N/A | 1979 | General |
| Sociological & Anthropological Writings | Desmond | Mallikarachchi | 2003 | General |
| Sociological Studies on the Students of a Residential University in Sri Lanka | Sachi | Sri Kantha | 1981 | General |
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| Soils & Fertilisers | F.S.C.P. | Kalpage | 1967 | General |
| Soils Of Ceylon & Fertiliser Use | C.R. | Panabokke | 1967 | General |
| Soils of Ceylon, The | S. N. U. | Fernando | 1969 | General |
| Soils Their Physics & Chemistry | A. N. | Puri | 1949 | General |
| Sojourns In Vanishing Jungles | Douglas B. | Ranasinghe | 2011 | General |
| Sokari of Sri Lanka | M.H. | Goonatilleka | 1976 | General |
| Soldier's Version, A - An Account on the on-going Conflict & Origin of Terrorism in Sri Lanka | Sarath, Major General | Munasinghe | 2000 | General |
| Some Aspects of Sub-National Administration & Development in Sri Lanka | Melvin | Wijesekera | 1984 | General |
| Some Aspects of the Law of Unjust Enrichment in South Africa & Ceylon | G.L. | Peiris | 1972 | General |
| Some Colourful Cameos of Sri Lankan Life | Henry P. | Abeyasekera | 1999 | General |
| Some Comments on The Constituent Assembly & The Draft Basic Resolutions | S. | Nadesan | 1971 | Politics |
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