| Identity Crisis of Sri Lankan Muslims | R.Vasundhara | Mohan | 1987 | General |
| Identity on the Borderline: Multicultural History in a Moment of Danger | Darini | Rajasingham-Senanayake | 2001 | General |
| Identity Politics & State-Building in Sri Lanka | Sisira | Pinnawala | 2014 | Politics |
| Identity: The Sri Lanka Architect | N/A | Sri Lanka Institute of Architects | 2011 | General |
| Ideology and the Constitution | Radhika | Coomaraswamy | 1996 | Politics |
| Ideology of Popular Justice in Sri Lanka, The | Neelan | Thiruchelvam | 1984 | General |
| Ideology, Caste, Class and Gender | Selvy | Thiruchandran | 1997 | General |
| If The Moon Smiled | Chandani | Lokuge | 2000 | Literature |
| 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 |
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