| Role of the Mahaweli Ganga in the Economy of Ceylon, The | Rupesinghe | Ceylon Today | 1966 | 15 | 5 | 15 -25 | General |
| Role of the Press in a Developing Country, The | Hulugalle | Ceylon Today | 1966 | 15 | 6 | 4 - 9 | General |
| Role of Volunteer Labour, The | N/A | Ceylon Today | 1965 | 14 | 11 | 18 - 23 | General |
| Role of Young Farmers' Clubs, The | Nanayakkara | Ceylon Today | 1960 | 9 | 12 | 15 - 17 | General |
| Roll of Honour, The | N/A | Journal of the D.B.U. | 1924 | XIV | 1 | 2 - 6 | General |
| Romance of Bulath, The | Juriansz | Times of Ceylon Annual | 1957 | N/A | N/A | N/A | General |
| Romance of Rice, The | Schokman | Times of Ceylon Annual | 1967 | N/A | N/A | N/A | General |
| Roosting Behaviour of the Common Mynahs (Acridotheres Tristis Melanosturnus) at an Urban Resort | | Siyoth | 2007 | 2 | 1 | 12 - 16 | Birds |
| Roots of Resistance: The Role of Jaffna Catholic Schools in the Formation of the Tamil Youth Organization in Sri Lanka, 1960-1972 | Thambynayagam | N/A | January 31, 2003 | N/A | N/A | 1 - 14 | General |
| Rough Draft of Ceylon Pigeons & Game Birds | Wait | Spolia Zeylanica | 1917 | X | XXXIX | 347 - 393 | General |
| Royal Asiatic Society, The (Ceylon Branch) | Blaze | Journal of the D.B.U. | 1945 | XXXV | 1 | 19 - 21 | General |
| Royal Lineage in the Prasastis of the 8th-10th Century Inscriptions, The | Perera | Ceylon Historical Journal, The | 1953 | 2 | 3 & 4 | 230 - 236 | History |
| Royal Navy & Trincomalee. The History of their Connection, c1750-1958, The | Colgate | Ceylon Journal of Historical & Social Studies, The | 1964 | 7 | 1 | 1 - 17 | History |
| Royal Visit | N/A | Ceylon Today | 1954 | 3 | 5 & 6 | 1 - 29 | General |
| Rrecord of a Rare Endemic Butterfly - Cinalese Bushbrown (Mycalesis rama Moore, 1892) | Perera | Loris, Vol 23, No's 3 & 4, 2003 | 2003 | 23 | 3 & 4 | 40 - 42 | General |
| Rt. Hon Don Stephen Senanayake, The | N/A | Journal of the D.B.U. | 1952 | XLII | 2 | 86 - 87 | General |
| Rubber Replanting Subsidy Scheme, The | Dias | Ceylon Today | 1960 | 9 | 6 | 22 - 26 | General |
| Rufous Turtle Dove - A New Sight Record | Siriwardhana | Loris | 1992 | XIX | 5 | 177 - 178 | General |
| Ruhuna National Park, The | Somanader | Loris | 1949 | V | 2 | 64 - 72 | General |
| Ruhuna Regained - Development at Uda Walawe | N/A | Ceylon Observer Pictorial | 1969 | N/A | N/A | N/A | General |
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