| 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 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 |
| Income Tax, Wealth Tax & Gifts Tax in Sri Lanka | S. | Balaratnam | 1979 | General |
| Incomplete Thombu, The | T. | Shanaathanan | 2011 | General |
| Incursions & Excursions in and around Sri Lankan Cricket | Michael | Roberts | 2011 | General |
| Independence Day of Ceylon,The - Sessional Paper XXII - 1947 | Govt of Ceylon | N/A | 1947 | Politics |
| Independence Day Souvenir 1984 | Tilak | Ratnakara | 1984 | General |
| Independence Day Souvenir 1986 | Department of Information | N/A | 1986 | General |
| Index to the Mahawansa together with Chronological Table of Wars & Genealogical Trees | John | Still | 1996 | Religion |
| India & Ceylon | Benimadhab | Barua | N/A | General |
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