| Third World Dilemma - In the Quest for a New International Economic Order | T.K. | Perera | 1979 | General |
| Thirteenth Amendment to Sri Lanka Constitution - Devolution or Comic Opera ? | Nadesan | Satyendra | N/A | General |
| Thirteenth Amendment to the Constitution (1987) | Govt of Sri Lanka | N/A | 1987 | Politics |
| Thirty Years Along Path of Friendship, Commemorating Diplomatic Relations Between Sri Lanka & China | Sri Lanka-China Society | N/A | 1986 | General |
| Thiruketheeswaram, One of the Pancha - Iswarams of Ancient Sri Lanka | Sanmugam | Arumugam | 2020 | Religion |
| This & That | Elmo | Jayawardena | 2013 | Literature |
| This Demi Paradise This Ceylon | A.A. | Russell | 1969 | General |
| This Inscrutable Englishman - Sir John D'Oyly (1774-1824) | Brendon | Gooneratne | 1999 | History |
| This Is Colombo Calling - Colombo Broadcasting Service | C.L. | Pujitha-Gunawardana | 1990 | General |
| This Man Kotelawala - Reflections on His Life and Work | P. | Nadesan | 1991 | Politics |
| This Man Razik | Nemsiri | Mutukumara | 1963 | General |
| This Other Lanka | D.T. | Devendra | 1941 | General |
| This Our Brother | Cecil M. | Matthews | N/A | General |
| This Piece of Planet Earth Sri Lanka and the Character of its People | Mervyn, Rev. Fr | Fernando | 1999 | General |
| This Total Art - Perceptions of Sri Lankan Theatre | Shelagh | Goonewardene | 1994 | General |
| Thistles in the Wind, An Autobiography | Nalini | de Sielvie | 2018 | General |
| Thondeswaram (Devinuwara - Dondra) | Thiru | Arumugam | 2017 | Religion |
| Thorana Guide To Sri Lanka, The | Lever Brothers | Cultural Conservation Trust | 1981 | General |
| Those Long Afternoons | E.F.C. | Ludowyk | 1989 | General |
| Those Were the Days | P. G. | Punchihewa | 2016 | General |
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