| Sigiriya Kassapa's Homage To Beauty | Siri | Gunasinghe | 2008 | History |
| Sigiriya Paintings | Raja | De Silva | 2009 | General |
| Sigiriya Project - 2nd Progressive Report, Excavations at Sigiriya | Senaka | Bandaranayake | 1988 | General |
| Sigiriya Project, Cultural Triangle, First Excavation Report | Senake | Bandaranayake | 1984 | General |
| Sigiriyan King, The | V. | Ariaratnam | 1973 | Literature |
| Silent Giver, The (Life of Hubert Cameron Paterson) | John | Simon | 1958 | General |
| Silhouette 2001-2002, Journal of the General Sir John Kotelawala Defence Academy | N/A | N/A | 2002 | General |
| Silvestro-Benedictine Monks in Sri Lanka | Bede, Rev. Fr | Barcatta | 1995 | Religion |
| Simple English - Sinhalese Dictionary | Arjuna | Hulugalle | 2001 | General |
| Simple English Dictionary - Extended Version with Sentences | Arjuna | Hulugalle | 1999 | General |
| Simple Guide to Spoken Sinhalese - A for Tourists in Sri Lanka | Aloysius | Aseervatham | 2011 | General |
| Simple Guide to Spoken Tamil, A - for Tourists in Sri Lanka | Aloysius | Aseervatham | 2011 | General |
| Sindbad in Serendib | Richard | Boyle | 2008 | General |
| Sing Every One Sing | N/A | N/A | 2001 | General |
| Sing Without Shame - Oral Traditions in Indo-Portuguese Creole Verse | Kenneth David | Jackson | 1990 | General |
| Singhala - Portuguese Art of the 16th & 17th Centuries | O. M. | da Silva Cosme | 2002 | History |
| Sinhabahu | Ediriwira | Sarachchandra | 2002 | Literature |
| Sinhala - A Unique Indo-Aryan Language | J.B. | Dissanayake | 1994 | General |
| Sinhala - Burgher, Reminiscences of a Sri Lankan | Malcolm | Abayekoon | 1998 | General |
| Sinhala - The Easy Way | P.R. | Wickremasinghe | 1964 | General |
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