| Not Our War | Sanjiva | Wijesinha | 2013 | Literature |
| Notes On A Tour in Australia & N.Z. by Mr C.V.Brayne, Land Commissioner | Govt of Ceylon | N/A | 1934 | General |
| Notes On Jaffna - Chronological, Historical, Biographical etc | John H. | Martyn | 1923 | General |
| Notes on Sinhala Culture | Sarath | Amunugama | 1990 | General |
| Notes on Some of the Principal Kandyan Chiefs & Headman & Their Dresses | H.W. | Codrington | 1910 | General |
| Notes on Some Sinhalese Families, Part IV - Ilangakon | P. E. | Pieris | 1933 | General |
| Notes on Various Birds of Ceylon - Rails, Waders, Gulls, Terns etc | W.E. | Wait | 1916 | General |
| Nugegoda Mission, The, after Ninety-One Yyears | Percy | Wickremesinghe | 1940 | Religion |
| Nugegoda, Glimpse of the Past | H. M. Mervyn. P | Herath | 2009 | General |
| Numerological Fortune in Matrimony | K.N., Pundit | Navaratnam | 1986 | General |
| Numismata Zeylanica | D..P.E. | Hettiaratchi | 1945 | General |
| Nutrition in Ceylon - Its Bearing On National Health & Well-Being | N/A | N/A | 1942 | General |
| Nutrition Strategy | Ministry of Plan Implementation | N/A | 1984 | General |
| Nutritional Status Its Determinants and Intervention Programmes | Ministry of Plan Implementation | N/A | N/A | General |
| Nuwara Eliya - The Beginnings and Its Growth | G.P.S.H. | de Silva | 1978 | General |
| Nyanaponika , 1901-1994 - A Farewell Tribute | Bhikkhu | Bodhi | 1995 | Religion |
| Obiter Dicta - A Collection of Essays & Addresses by Justice Gratien | E.F.N. | Gratien | 1953 | General |
| Objects & Reasons of The Proposed Legislation - The All Party Conference | Govt of Sri Lanka | N/A | 1984 | General |
| Oblates of Mary Immaculate in Ceylon 1848-1948 | D.J.B. | Kuruppu | 1948 | Religion |
| Oblates Serve in Sri Lanka | W.L.A., Rev Fr | Don Peter | 2000 | Religion |
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