| Royal-Thomian Cricket Centenary Issue 1880-1979 | Centenary Souvenir Committee | N/A | 1979 | General |
| Royalty in Ancient Ceylon, During the Period of the "Great Dynasty" | John M. | Seneveratne | 2005 (1918) | History |
| Rubber - Process of Manufacture | Henry S. | Thomas | 1962 | General |
| Rubber and Rubber Reserach in Ceylon | H.E. | Young | N/A | General |
| Rubber Goods Industry in Sri Lanka, The | Industrial Development Board | N/A | 1979 | General |
| Rubber Producing Companies, 1910 - 1911 | N/A | Gow, Wilson & Stanton Ltd | 1911 | General |
| Rubber Research In Ceylon | N/A | N/A | 1918 | General |
| Rugby Across The Straits | Neil | Wijeratne | 1999 | General |
| Ruhuna - A Study of its History, Society & Ideology | C.A. | Chandraprema | 1989 | General |
| Ruhuna An Ancient Civilisation Re-Visited - Numismatic & Archaeological Evidence on Inland & Maritime Trade | Osmund | Bopearachchi | 1999 | History |
| Ruined Cities of Ceylon, The | Henry W. | Cave | 1900 | General |
| Ruins | Rajith | Savanadas | 2016 | Literature |
| Ruins of Sri Lanka | Somapala | Jayawardhana | 1987 | General |
| Rulers of Sri Lanka, The | Vernon L. B., Dr | Mendis | 2000 | History |
| Running In The Family | Michael | Ondaatje | 1983 | General |
| Rural Change & Spatial Reorganization in Sri Lanka | Scandinavian Inst of Asian Studies | N/A | 1977 | General |
| Rural Development Intiatives - Helping The Rural Millions in Sri Lanka | Warnasena | Rasaputra | 1983 | General |
| Rural Poverty in Sri Lanka | Nandasena | Ratnapala | 1989 | General |
| Rural South Asia - Linkages, Change & Development | Peter | Robb | 1983 | General |
| Rural Theatre & Social Satire of Sri Lanka, The | M.H. | Goonatilleka | N/A | General |
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