| Nattukottai Chettiar, The - Merchant Bankers in Ceylon | W.S. | Weerasooriya | 1973 | General |
| Natural History of Ceylon, Sketches of the | Sir J.Emerson | Tennent | 1993 | General |
| Natural Resources of Sri Lanka - Conditions & Trends | Nat Resources, Energy & Science Authority | N/A | 1991 | General |
| Natural Resources of Sri Lanka 2000 | K. D. | Arulpragasam | 2000 | General |
| Natural Vegetation of Ceylon | S.N.U. | Fernando | N/A | General |
| Naturalist's Life, A - W.W.A.Phillips | Eileen | Wynell-Mayow | 2002 | General |
| Naturalist\'s Guide to the Mamals of Sri Lanka, A | Gehan | de Silva Wijeyeratne | 2020 | General |
| Naturalist\'s Guide to the Reptiles of Sri Lanka, A | Anslem | de Silva | 2017 | General |
| Nature Lovers Bedside Book, The | Douglas B. | Ranasinghe | 2015 | History |
| Nature Lovers Bedside Book, The | Douglas B. | Ranasinghe | 2015 | History |
| Nature Photographer 2002 | N/A | N/A | 2002 | General |
| Nature Photographer Portfolio 2001 | N/A | N/A | 2001 | General |
| Navagampura & Aramaya Place - Support Based Housing Studies | Sunimal | Fernando | 1987 | General |
| Navasilu, No 4, Part 2 - Journal of the English Assoc of Sri Lanka | Thiru | Kandiah | N/A | Literature |
| Navigating Boundaries, The Asian Diaspora in Torres Strait | Anna | Shnukal | 2004 | General |
| Needs of Children & Adolescents - A Case Study of Sri Lanka | Marga Institute | N/A | 1975 | General |
| Negotiating Peace in Sri Lanka - Efforts, Failures & Lessons | Kumar, Dr | Rupesinghe | 1998 | General |
| Negotiating Peace in Sri Lanka - Vol 1, Efforts, Failues & Lessons | Kumar | Rupesinghe | 2006 | General |
| Negotiating Peace in Sri Lanka - Vol 2, Efforts, Failures & Lessons | Kumar | Rupesinghe | 2006 | General |
| Negotiating Processes in Sri Lanka (Marga 2/19) | Liz | Philipson | 2001 | General |
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