| Studies in Hinduism | K. | Navaratnam | 1963 | Religion |
| Studies in International Law | C.F. | Amerasinghe | 1969 | General |
| Studies in the Philosophy and Literature of Pali Abhidhammika Buddhism | Aloysius | Pieris | 2004 | Religion |
| Studies of Some Famous Criminal Cases | W. | Thalgodapitiya | 1963 | General |
| Study of Selected Agricutural Productivity Committee in 1975 | Samir | Asmar | 1975 | General |
| Study of the Cost Expenditure of the Family Planning Programme in Sri Lanka 1975-1981 | Ministry of Plan Implementation | N/A | 1985 | General |
| Study of The Economic History of Pre-Modern Sri Lanka, A | W.I. | Siriweera | 1994 | General |
| Study on the District Minister Scheme, A | Institute of Development Administration | N/A | 1984 | General |
| Stupa in Ceylon, The | S. | Paranavitana | 1947 | Religion |
| Subject Index to the Industrial Court Awards | Dept of Labour | N/A | 1973 | General |
| Subject Index to the Industrial Court Awards, A | Dept of Labour | N/A | 1973 | General |
| Submissions of NGO's to UN Sub-Committee on Human Rights in Sri Lanka | International Federation of Tamils | N/A | 1990 | General |
| Successful Migrant Women: Self Perceptions of Ceylonese Burgher Women, 1947-1964 | Anne | Pereira | 1971 | General |
| Suicide Club, The | Herman | Gunaratne | 2010 | General |
| Suicide in Sri Lanka | Padmasiri | De Silva | 1989 | General |
| Sullen Hills, The | Roderic | Grigson | 2018 | Literature |
| Sultan's Kitchen - Recipes From India, Pakistan, Burma & Ceylon | Doris M | Ady | 1968 | General |
| Sun at my Back, The | Clare | Senewiratne | 1983 | General |
| Sunil Santha, The Man who invented Sinhala Music for a Modern Age | Tony, Dr | Donaldson | 2016 | General |
| Sunset in a Valley - Kotmale, Record of a Lost Culture & Civilization | Anuradha | Seneviratna | 2001 | General |
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