| Importing From Sri Lanka | N/A | N/A | 1992 | General |
| Improving Managementof Small-Scale Irrigation Schemes | Inge | Jungeling | 1989 | General |
| In Defence of Politics | Bernard | Crick | 1964 | Politics |
| In Defence of Politics | Bernard | Crick | 1964 | Politics |
| In Honour of C.C. de Silva - On His Retirement | B.N.D., Dr | Fernando | 1966 | General |
| In Old Ceylon | Reginald | Farrer | 1908 | General |
| In Pursuit of Peace - Non-Alignment & Regional Cooperation | A.C.Shahul | Hameed | 1983 | General |
| In Remembrance - Lionel Douglas Walter de Soysa | N/A | N/A | 1924 | General |
| In Ruhunu Jungles | Douglas | Raffel | 1959 | General |
| In Search of Ceylon | Marcelline | Jayekody | 1964 | General |
| In The Days of Sri Wickramarajasingha Last King of Kandy | P. | Dolapihilla | 1959 | History |
| In The Footsteps of The Buddha | Govt of India | N/A | N/A | Religion |
| In the Garden Secretly and other stories | Jean | Arasanayagam | 2000 | Literature |
| In The Line of Duty - Life & Times of a Surgeon in War & Peace | Gamini | Goonetilleke | 2008 | General |
| In the Pursuit of Governance | M. D. D. | Pieris | 2002 | General |
| In the Same Boat | Channa | Wickremesekera | 2010 | Literature |
| In the Shadow of a People\'s President | Evans Gunalal | Cooray | 2008 | Politics |
| In the Skin of a Lion | Michael | Ondaatje | 1997 | Literature |
| Incentives & Behaviour in the Ethnic Politics of Sri Lanka & Malaysia | Donald L. | Horowitz | 1993 | History |
| Incentives & Behaviour in the Ethnic Politics of Sri Lanka & Malaysia | Donald L. | Horowitz | 1993 | General |
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