| Origin of the Name Galle Face, The | N/A | Journal of the D.B.U. | 1963 | LIV | 1 - 4 | 59 | General |
| Origin of the Sinhalese Language | Alwis | Journal of the Royal Asiatic Society | 1865-66 | IV | 13 | 143 - 156 | General |
| Origin of the Sinhalese Language, The | Shahidullah | Journal of the Royal Asiatic Society | 1962 | VIII New Series | 1 | 108 - 117 | General |
| Our Crocodiles - Why Protect Them ? | Farook | Loris | 1979 | XV | 1 | 45 - 46 | General |
| Our Deer | Tutein-Nolthenius | Loris | 1977 | XIV | 3 | 147 - 149 | General |
| Our Diminishing Wild Life | Norris | Loris | 1963 | IX | 5 | 277 - 284 | General |
| Our Elephants | N/A | Ceylon Today | 1960 | 9 | 2 | 21 - 22 | General |
| Our Elephants | de Alwis | Loris | 1969 | XI | 6 | 350 - 354 | General |
| Our Food Resources | Banda | Ceylon Today | 1965 | 14 | 11 | 11 - 13 | General |
| Our Migrant Birds | Munidasa | Ceylon Today | 1970 | XVIII | 1 - 6 | 40 - 44 | General |
| Our Names, Their Origin and Significance | Anthonisz | Journal of the D.B.U. | 1914 | VII | 1 & 2 | 37 - 54 | General |
| Our Paradise Isle | Munzeer | Observer Pictorial | 1996 | N/A | N/A | N/A | General |
| Our Vanishing Wildlife | Deraniyagala | Times of Ceylon Annual | 1963 | N/A | N/A | N/A | General |
| Outbreak of the Kandyan-Dutch War of 1761 & the Great Rebellion, The | Paulusz | Journal of the Royal Asiatic Society | 1953 | III New Series | 1 | 29 - 52 | History |
| Over the Hills & Faraway - Travel by Rail, "Udaratte Menike" | Van Reyk | Ceylon Obsever Pictorial | 1958 | N/A | N/A | N/A | General |
| Over View of Sri Lanka's Mediaeval Coinage With a Consideration of Some Interactions & Influences of the South Indian Coinage of the Period, An | Medis | Journal of the Royal Asiatic Society | 1992/93 | XXXVII New Series | N/A | 59 - 68 | General |
| Overlordship of Ceylon in the 13th, 14th & 15th Centuries, The | Paul | Journal of the Royal Asiatic Society | 1921 | XXVIII | 74 | 83 - 148 | History |
| Pachydermophobia - Thoughts on Reading Sir Samuel Baker's "The Rifle & Hound in Ceylon" | De Costa | Loris | 1966 | X | 6 | 352 - 355 | General |
| Paddy Cultivation & the Dutch | N/A | Journal of the D.B.U. | 1937 | XXVII | 1 | 38 - 39 | History |
| Paddy Lands Irrigation Ordinances & the Revival of Traditional Irrigation Customs 1856-1871, The | Roberts | Ceylon Journal of Historical & Social Studies | 1967 | 10 | 1 & 2 | 114 - 130 | General |
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