| Rites & Rituals, Customs & Manners of Sri Lankan Buddhists | Kirinde, Rev.Dr | Assaji Thero | 2009 | Religion |
| Ritigala | N/A | N/A | 1983 | General |
| Rituals of the Kandyan State | H.L. | Seneviratne | 1978 | General |
| Rituals, Folk Beliefs & Magical Arts of Sri Lanka | Mihindukulasuriya Susantha | Fernando | 2000 | General |
| River In The Jungle | S.D. | de Lanerolle | 1977 | General |
| Road Directory - Colombo, Dehiwela, Mt Lavinia & Ratmalana | R., Mrs | Christie-David | 1975 | General |
| Road from Elephant Pass, The | Nihal | De Silva | 2003 | Literature |
| Road to Nandikadal, True Story of Defeating the Tamil Tigers | Kamal, Major-General | Gunaratne | 2016 | General |
| Road to Temple Trees, The | H. | Kumarasingham | 2015 | Politics |
| Robe & Plough: Monasticism & Economic Interest in Early Medieval Sri Lanka | R.K.L.H. | Gunawardana | 1979 | General |
| Robert Knox In The Kandyan Kingdom | E.F.C. | Ludowyk | 1948 | History |
| Rock & Wall Paintings of Sri Lanka, The | Senake | Bandaranayake | 1986 | General |
| Rocks & Minerals | Paul R. | Shaffer | 1981 | General |
| Rocks & Minerals of Ceylon | H.S. | Gunaratne | 1967 | General |
| Rodiya Girl & Other Stories | J. | Vijayatunga | 1960 | Literature |
| Role of Expatriates in the Resolution of the Sri Lankan Crisis, The | QASLU | Veritas | 1985 | General |
| Role of Plant Nutrition in Crop Production, The | S. | Kandiah | 1954 | General |
| Role of the Attorney General of Sri Lanka & the Rule of Law | Palitha | Fernando | 2016 | General |
| Role of the Churches in the Ethnic Conflict, The (Marga 17/19) | Neville | Jayaweera | 2001 | Religion |
| Role of the Churches, The: A Historical Perspective | Jeffrey | Abayasekera | 2001 | Religion |
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