| Progress 1909 - 1959 A. M. M. Abdul Cader ( A.M.M.A.C.) | N/A | N/A | 1959 | General |
| Progress 1986 | Ministry of Coconut Industries | N/A | 1986 | General |
| Progress of the Colombo Plan 1967-1968 | Colombo Plan Bureau | N/A | 1969 | General |
| Progressive Grammar of Common Tamil, A | A.H. | Arden | 1934 | General |
| Progrss of the Colombo Plan | Colombo Plan Bureau | N/A | 1966 | General |
| Projects of National Development | The Colombo Plan | N/A | 1972 | General |
| Proposals Sent to the Govt of India by the Govt of Sri Lanka | Govt of Sri Lanka | N/A | 1986 | General |
| Proposed Foreign Investment Authority Law of Sri Lanka, The - A Critical Analysis | Senaka | Weeraratna | 1982 | General |
| Proposed Scheme of Church Union in Ceylon | N/A | N/A | N/A | Religion |
| Prose & Verse | Florence | Wijemanne | N/A | Literature |
| Prose Selections | G. P. D. | Senaratne | 2001 | Literature |
| Prospects for Peace in Sri Lanka | N/A | N/A | 1986 | General |
| Prospectus 1984 (SLIDA) | Sri Lanka Institute of Development Administration | N/A | 1984 | General |
| Protection - Lectures & Articles | K. | Balasingham | N/A | Politics |
| Protestant Christianity - Will It Survive in Ceylon | P.G. | de Silva | 1956 | Religion |
| Proud & Prejudiced - The Story of the Burghers of Sri Lanka | Rodney | Ferdinands | 1995 | General |
| Psychosocial Wellbeing at Work: A Study of Female Factory Workers | Handun Rasari | Athukorala | 2008 | General |
| Ptolemy & Nagadipa | P. | Weerasinghe | 1985 | History |
| Public Administration in Ceylon | Charles, Sir | Collins | 1951 | General |
| Public Corporations in Ceylon | A.R.B. | Amerasinghe | 1971 | General |
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