| Illicit Immigrant | Raja | Proctor | 1977 | Literature |
| Illustrated Fied Guide to the Fauna of Sri Lanka, An, Vol 1, Butterflies | Rajika | Gamage | 2013 | General |
| Illustrated Field Guide to the Flowers of Sri Lanka | J & J | de Vlas | 2008 | General |
| Illustrated Guide - Royal Botanic Gardens Peradeniya | H.F. | Macmillan | 1999 | General |
| Illustrated Guide - Royal Botanic Gardens, Peradeniya | H.F. | Macmillan | 1911 | General |
| Illustrated Guide to the Birds of Sri Lanka, An | Sarath | Kotagama | 2010 | General |
| Illustrated Guide To The Buried Cities of Ceylon, An | R., Mrs | Jones-Bateman | 1932 | History |
| Illustrated Guide to the Butterflies of Sri Lanka, An | Rajika | Gamage | 2007 | General |
| Illustrated Guide to the Flowers of Sri Lanka, Vol 2 | J & J | de Vlas | 2014 | General |
| Illustrations & Views of Dutch Ceylon 1602-1796 | R.K., Dr | de Silva | 1988 | General |
| Illustrations of Some Birds of Ceylon | N/A | N/A | N/A | General |
| Image Of An Island - A Portrait of Ceylon | Reg | Van Cuylenburg | 1962 | General |
| Images of Birds - Vol 1, A Random Selection of the Birds of Sri Lanka | T. S. U., Dr | de Zylva | 2000 | General |
| Images of British Ceylon (Nineteenth Century Photographs) | Ismeth | Rahim | 2000 | General |
| Images of Jaffna - A Government Agent's Recollections | Vernon | Abeysekera | 1989 | General |
| Images of Sri Lanka Through American Eyes - 19th & 20th Centuries | H.A.I. | Goonetileke | 1975 | General |
| Imagining Modernity - The Architecture of Valentine Gunasekara | Anoma | Pieris | 2007 | General |
| Immigration, A Commitment to Australia - The Fitzgerald Report | N/A | N/A | 1988 | General |
| Immortal Song, The | Albert | Jayawardhana | N/A | Literature |
| Impact of Internal Ethnic Conflicts on the Region: Sri Lanka Case | Victor | Gunewardena | 1985 | General |
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