| The Central, Vol XXXII, No 1, 1937 | N/A | N/A | 1937 | General |
| The Disappeared in Sri Lanka | N/A | N/A | 1991 | General |
| The Gateway - Vol 9 - Royal Primary School Journal | H.P. | Jayawrdena | 1957 | General |
| The Great Adventures of Little Dina Lanka's Wonder Girl | Rodney Mervyn | Downall | 2007 | Literature |
| Theatre in Sri Lanka | A.J. | Gunawardana | 1976 | General |
| Then You'll Remember Me | Cherise | Pereira | 2007 | General |
| Theory and Practice of Growing Rice | Minoru | Matsubayashi | 1963 | General |
| Theravada Man | Manuka | Wijesinghe | 2020 | Literature |
| Theravada Man | Manuka | Wijesinghe | 2009 | Literature |
| Theses in Agricultural Sciences 1976-1987 | University of Peradeniya | N/A | 1988 | General |
| They Call Him Ken, The Life & Times of a Corporate Colossus | Savithri | Rodrigo | 2017 | General |
| They Marched to the Tune of Wings | Kenneth | Reeves | 2009 | General |
| Thimpu Talks, The - The Stand Taken By The Sri Lankan Government | Ministry of State | N/A | 1985 | General |
| Thin Veils in the Shadow of the Gun & the Wicked Witch | Sumathy | N/A | 2003 | Literature |
| Things Seen in Ceylon | C. | Rettie | 1930 | General |
| Things Sinhala | Hemachandra | Senaratne | 2013 | General |
| Third Interim Report of the Special Presidential Commission of Inquiry | Government of Sri Lanka | N/A | 1980 | General |
| Third Interim Report on the Administration of Prisons & Treatment of Prisoners | Govt of Ceylon | N/A | 1938 | General |
| Third Report of the Ceylon Historical Manuscripts Commission | Govt of Ceylon | N/A | 1951 | General |
| Third Woman, The | Punyakante | Wijenaike | 1963 | Literature |
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