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| Indo-Sri Lanka Agreement of July 1987 | Shelton. U. | Kodikara | 1989 | General |
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| Industrial Law and Relations in Ceylon | W.P.N. | De Silva | 1964 | General |
| Industrialised Nations of the West & The Third World, The | S.P. | Amerasingam | 1982 | General |
| Influence of Foreign Trade on the Level &Growth of National Income of Ceylon, 1926-1957 | Warnasena | Rasaputram | 1964 | General |
| Information Needs & Information Practices of Agricultural Scientists in Sri Lanka | Irangani | Mudannayake | 1989 | General |
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| Inheritance | Jean | Arasanayagam | 2001 | Literature |
| Ink of Lanka | Tilak | Samarawickrema | 2009 | General |
| Inland Revenue (Amendment) Law, No 16 of 1976 | National State Assembly | N/A | 1976 | Politics |
| Inscriptions - Archaeological Servies, Vol 2 | Nandadeva, Dr | Wijesekera | 1990 | General |
| Inscriptions of Ceylon - Vol 1, Early Brahmi Inscriptions | S. | Paranavitana | 1970 | History |
| Insect & Mite Pests of Tea in Ceylon and Their Control | J.E. | Cranham | 1966 | General |
| Insects, The Hidden Treasures of Mahausakande | Jayanthi | Edirisinghe | 2019 | General |
| Insecurity of Tamils in Sri Lanka | Tamil Information Centre | N/A | 1983 | General |
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