| Intervention in Sri Lanka - The IPKF Experience Retold | Harkirat | Singh | 2006 | General |
| Intervention in the Devolution Debate | Sumanasiri | Liyanage | 1998 | General |
| Into the Wilds of Sri Lanka | Cecil | Dharmasena | 2015 | General |
| Intrigues of the Lion | Carl | Muller | 2013 | Literature |
| Introducing Ceylon | H. A. J. | Hulugalle | 1949 | General |
| Introduction to Centralised Traffic Control with Automatic Colour Light Signalling | N/A | N/A | 1962 | General |
| Introduction to Indian Art | Ananda | Coomaraswamy | 1969 | General |
| Introduction to Jaffna Cookery | Sathanithi | Somasekaram | 1995 | General |
| Introduction to Law in Sri Lanka, An | Ruana | Rajepakse | N/A | General |
| Introduction to Roman - Dutch Law, An | R.W. | Lee | 1931 | General |
| Introduction to the Criminal Justice Legislation of Sri Lanka, An | N/A | N/A | 1987 | General |
| Introduction to the Deer of Australia, An | Arthur | Bentley | 1998 | General |
| Introduction to the Legal System of Ceylon, An | L.J.M. | Cooray | 1972 | General |
| Introduction To The Study of Some Living Religions of the East | Sydney | Cave | 1921 | Religion |
| Inventory of Sri Lanka Maps in the General Archives in the Netherlands | K.D. | Paranavitana | 1984 | General |
| Investigating the Dhamma, A Collection of Papers | Bhikkhu | Bodhi | 2015 | Religion |
| IPKF in Sri Lanka | Depinder. Lt-Gen | Singh | N/A | General |
| Irangani, A Tragedy of our Times | Ernest | Macintyre | 2012 | Literature |
| Irangani, as told to Kumar de Silva | Kumar | de Silva | 2013 | General |
| Iron Fence, The - A Novel | Neluka | Silva | 2011 | Literature |
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