| 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 |
| Islam in Seilan - Vol 1, No1, 1980 | Muslim Law Research Committee | N/A | 1980 | Religion |
| Islamic Banking - An Alternatye Approach to Finance, Dr A.M.A.Azzes Oration 2014 | A. I. | Marikkar | 2014 | General |
| Island Ceylon | Roloff | Beny | 1980 | General |
| Island Interlude | Esmee | Rankine | 1971 | General |
| Island of a Thousand Mirrors | Nayomi | Munaweera | 2012 | Literature |
| Island of Blood | Anita | Pratap | 2001 | General |
| Island of Light, Buddhism in Sri Lanka. A Concise History & Guide to its Sacred Sites | T. Y. | Lee | 2011 | Religion |
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