| 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 |
| Those Were The Days | P.G. | Punchihewa | 2007 | General |
| Three Dispositions Towards The Past: One Sinhala, Two Tamil | E.Valentine | Daniel | 1992 | General |
| Three Essays on a Sri Lanka Household Survey | Angus | Deaton | 1981 | General |
| Three Generation Tale, A | Srini | Peries | 2012 | Literature |
| Three Prime Ministers of Ceylon - An Inside Story | J.L. | Fernando | 1963 | Politics |
| Three Score and Ten - Royal vs St Thomas' Cricket Encounters | S.P. | Foenander | 1949 | General |
| Three Women | Chitra | Fernando | 1983 | Literature |
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