| Life Under Milk Wood - Women Workers in Rubber Plantations, An Overview | Jayadeva | Uyangoda | 1995 | General |
| Life, A Journey into the Wilds of Sri Lanka | Janaka | Gallangoda | 2012 | General |
| Light of Asia, The | Edwin, Sir | Arnold | 1971 | Religion |
| Light Set On A Hill, A - St Lucia's Parish, Kotahena 1760-1987 | Placidus M. | Fernando | 1988 | Religion |
| Lilac of the Tabebua | Mahasara | Gunaratne | 1996 | Literature |
| Linguistics Strands in the Maldives | C.H.B | Reynolds | N/A | General |
| Links Between Sri Lanka & Australia - A Book About the Sri Lankans in Australia | W.S. | Weerasooria | 1988 | General |
| Links Between Sri Lanka & The Netherlands - A Book of Dutch Ceylon | R.L. | Brohier | 1978 | General |
| Lion & The Sword, The - Vol 1, An Ethnological Study of Sri Lanka | Asiff | Hussein | 2001 | General |
| Lion & the Sword, The, Vol 2 - An Ethnological Study of Sri Lanka | Asiff | Husssein | 2008 | General |
| Lionel Bopage Story, The - Rebellion, Repression & the Struggle for Justice in Sri Lanka | Michael Colin | Cooke | 2011 | General |
| Lionel Wendt - A Centennial Tribute | Lionel Wendt Memoriual Fund | N/A | 2000 | General |
| Lionel Wendt Photographs | Albert | Dharmasiri | 1994 | General |
| Lionel Wendt's Ceylon | Lionel | Wendt | 1950 | General |
| Lionel Wendt, Art & Life | Sampath | Bandara | 2017 | General |
| Lions of Sri Lanka, Featuring the 30 Greatest Cricketers | N/A | N/A | 2019 | General |
| List of Moths Recorded from Ceylon, Colombo Museum | N/A | N/A | 1903 | General |
| List of Writers on Ceylon from "Ferguson's Ceylon Handbook & Directory" | N/A | N/A | 1886 | General |
| Literature of Sri Lanka | C.E. | Godakumbura | 1976 | Literature |
| Lithic & Other Inscriptions of Ceylon - Part 1 (Epigraphia Zeylanica, Vol VI, Part 1) | S. | Paranavitana | 1973 | History |
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