| Working Time Table 1964 - C.G.R. | Ceylon Government Railway | N/A | 1964 | General |
| Working Underground - The LSSP in Wartime | Regi | Siriwardena | 1999 | Politics |
| World and It's Peoples, The - India & Ceylon 2 | Giuseppe | Mormom | 1970 | General |
| World and It's Peoples, The - India 1 | Giuseppe | Sormam | 1970 | General |
| World Buddhism Vesak Annual, Sri Lanka 1962 | N/A | N/A | 1962 | Religion |
| World Buddhism Vesak Annual, Sri Lanka 1964 | N/A | N/A | 1964 | Religion |
| World Heritage Sites in Sri Lanka | Siri | Ipalawatte | 2013 | General |
| World I Saw, The - Reflections of a Lifetime of Travel | Rienzie | Weereratne | 2008 | General |
| Worm\'s Eye View | Ransiri Menike | Silva | 2012 | Literature |
| Worship & Conflict Under Colonial Rule - A South Indian Case | Arjun | Appadurai | 1981 | Religion |
| Writing an Inheritance - Women's Writing in Sri Lanka 1860 - 1948, Vol 1 | Neloufer | de Mel | 2002 | Literature |
| Writing That Conquers - Re-reading Knox's An Historical Relation of the Island Ceylon | Sarojini | Jayawickrama | 2004 | General |
| Writings & Musings | Thiru | Arumugam | 2016 | Literature |
| Writings of Sri Kathiresu Ramachandra, 1895 - 1976 | Ramachandra | Balasuperamaniam | 2017 | General |
| Written in the Stars | Nalini | de Sielvie | 2021 | Literature |
| WTO, Globalization & Eppawala after Seattle | D. L. O. | Mendis | 2000 | General |
| Xavier As Educator | W.L.A., Rev Fr | Don Peter | 1974 | Religion |
| Yaal Players, The - Memories of Old Jaffna | Vimala | Ganeshananthan | 2013 | General |
| Yakada Yaka | Carl | Muller | 1994 | Literature |
| Yaksas - Part 1 & Part 2 | Ananda K. | Coomaraswamy | 1971 | General |
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