| Image of an Island, The - Old Maps | Fernando | Tourists' Ceylon | 1968 | 2 | 1 | 3 - 11 | General |
| Image, The - 'Pre-eminent From Head to Foot' | Saparamadu | Ceylon Observer Pictorial | 1973 | N/A | N/A | N/A | Religion |
| Immediate Impact of the First Railway in Sri Lanka, The | Munasinghe | University of Colombo Review | 1987 | 7 | N/A | 39 - 51 | General |
| Impact of High Yielding Varieties of Rice on a Settlement Scheme in Ceylon, The | Amerasinghe | Modern Ceylon Studies | 1972 | 3 | 1 | 19 - 35 | General |
| Impact of the Waste Lands Legislation & the Growth of Plantations on the Techniques of Paddy Cultivation in British Ceylon,The: A Critique | Roberts | Modern Ceylon Studies | 1970 | 1 | 2 | 157 - 198 | History |
| Importance of Dutch Rule in Ceylon, The | Mendis | Journal of the D.B.U. | 1955 | XLV | 4 | 129 - 133 | History |
| Importance of Rice in our Economy, The | Kalpage | Ceylon Today | 1965 | 14 | 12 | 5 - 11 | General |
| Important Medicinal Plants Component of the Sri Lanka Flora | Ekanayake | Loris | 1984 | XVI | 6 | 276 -280 | General |
| Impressions from the Land of Pagodas & Temple Bells, Glimpses of Burmese Military History - 2 | Brohier | Journal of the D.B.U. | 1933 | XXII | 3 | 119 - 123 | General |
| Impressions from the Land of Pagodas & Temple Bells, Legends Linking Ceylon with Burma - 1 | Brohier | Journal of the D.B.U. | 1932 | XXII | 2 | 62 - 67 | General |
| Improving the Telecommunications Network | Fernando | Ceylon Today | 1966 | 15 | 11 | 15 - 18 | General |
| In a Cave - Amidst Leopard, Bear & Elephant | Wickramasinghe | Loris | 1984 | XVI | 6 | 294 - 298 | General |
| In Batticaloa a Man Can Forget | de Folo | Times of Ceylon Annual | 1967 | N/A | N/A | N/A | General |
| In Memoriam - Cecil Alexander Speldewinde | N/A | Journal of the D.B.U. | 160 | L | 1 & 2 | 57 | General |
| In Memoriam - Douglas St. Clive Budd Jansze | N/A | Journal of the D.B.U. | 1967 | LVII | 1 - 4 | 49 | General |
| In Memoriam - Dr V.R. Schokman | Toussaint | Journal of the D.B.U. | 1953 | XLIII | 3 | 140 | General |
| In Memoriam - Durand Victor Altendorff | N/A | Journal of the D.B.U. | 1967 | LVI | 1 - 4 | 49 - 50 | General |
| In Memoriam - Edgar Allan Garvin Van Der Straaten, I.S.O. | Brohier | Journal of the D.B.U, | 1953 | XLIII | 3 | 136 - 139 | General |
| In Memoriam - James Reginald Toussaint | Brohier | Journal of the D.B.U. | 1957 | XLVII | 1 | 7 - 11 | General |
| In Memoriam - William Edward Van Der Smagt De Rooy | N/A | Journal of the D.B.U. | 1957 | XLVII | 4 | 91 - 92 | General |
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