| 34/1982 : Naleemiah Institute Of Islamic Studies Society (Incorporation) |
| 04/1975 : Naming of Street and the Control of the Erection of Monuments |
| 49/1982 : Nation Builders Association (Incorporation) |
| 09 /2009 : Nation Building Tax |
| 32/2009 : Nation Building Tax (Amendment) |
| 10/2011 : Nation Building Tax (Amendment) |
| 11/2013 : Nation Building Tax (Amendment) |
| 10/2014 : Nation Building Tax (Amendment) |
| 12/2015 : Nation Building Tax (Amendment) |
| 22/2016 : Nation Building Tax (Amendment) |
| 13/2017 : Nation Building Tax (Amendment) |
| 20/2018 : Nation Building Tax (Amendment) |
| 20/2019 : Nation Building Tax (Amendment) |
| 03/2020 : Nation Building Tax (Amendment) |
| 09/2012 : Nation Building Tax (Amendment) Act, No. 9 of 2012. |
| 66/1988 : National Academy Of Sciences Of Sri Lanka (Incorporation) |
| 49/1971 : National Apprenticeship |
| 04/1987 : National Apprenticeship (Amendment) |
| 01/1988 : National Apprenticeship (Amendment) |
| 53/1998 : National Aquaculture Development Authority of Sri Lanka |
| 23/2006 : National Aquaculture Development Authority of Sri Lanka (Amendment) |
| 54/1981 : National Aquatic Resources Research and Development Agency |
| 32/1996 : National Aquatic Resources Research and Development Agency (Amendment) |
| 48/1973 : National Archives |
| 30/1981 : National Archives (Amendment) |
| 05/1980 : National Arts Council, Mahanuwara (Incorporation) |
| 19/2018 : National Audit |
| 32/1997 : National Authority on Teacher Education |
| 08/2015 : National Authority on Teacher Education (Repeal) |
| 27/2006 : National Authority on Tobacco and Alcohol |
| 03/2015 : National Authority on Tobacco and Alcohol (Amendment) |
| 50/1998 : National Child Protection Authority |
| 11/1986 : National Council For Mental Health Sahanaya (Incorporation) |
| 35/1982 : National Crafts Council and Allied Institutions |
| 04/1996 : National Crafts Council and Allied Institutions (Special Provisions) |
| 11/1984 : National Dangerous Drugs Control Board |
| 41/1986 : National Dangerous Drugs Control Board (Amendment) |
| 21/1990 : National Dangerous Drugs Control Board (Amendment) |
| 09/1985 : National Defence Fund |
| 10/1991 : National Defence Fund (Amendment) |
| 16/2018 : National Defence Fund (Amendment) |
| 10/1990 : National Development Bank of Sri Lanka (Amendment) |
| 10/1992 : National Development Bank of Sri Lanka (Amendment) |
| 34/1999 : National Development Bank of Sri Lanka (Amendment) |
| 01/2005 : National Development Bank of Sri Lanka (Consequential Provisions) |
| 02/1979 : National Development Bank of Sri Lanka Act |
| 19/1991 : National Education Commission |
| 17/2006 : National Enterprise Development Authority |
| 18/2014 : National Enterprise Development Authority |
| 47/1980 : National Environmental |
| 56/1988 : National Environmental (Amendment) |
| 53/2000 : National Environmental (Amendment) |
| 22/2023 : National Eye Bank Trust of Sri Lanka |
| 45/1980 : National Film Corporation of Sri Lanka (Amendment) |
| 03/1986 : National Film Corporation Trust for Film Artistes and Technicians |
| 50/1993 : National Gem and Jewellery Authority |
| 13/1981 : National Health Development Fund |
| 17/1984 : National Health Development Fund (Amendment) |
| 26/1987 : National Health Development Fund (Amendment) |
| 03/1988 : National Heritage Wilderness Areas |
| 09/1978 : National Housing (Amendment) |
| 49/1981 : National Housing (Amendment) |
| 17/1979 : National Housing Development Authority |
| 05/1982 : National Housing Development Authority (Amendment) |
| 20/1988 : National Housing Development Authority (Amendment) |
| 30/1999 : National Housing Development Authority (Amendment) |
| 23/2002 : National Housing Development Authority (Amendment) |
| 32/2003 : National Housing Development Authority (Amendment) |
| 37/2008 : National Housing Development Authority (Special Provisions) |
| 18/1997 : National Human Resources Development Council of Sri Lanka |
| 07/2024 : National Hydrographic Act |
| 22/2019 : National Innovation Agency |
| 23/1976 : National Institute of Business Management |
| 28/1991 : National Institute of Business Management (Amendment) |
| 02/2014 : National Institute of Business Management (Amendment) |
| 01/2001 : National Institute of Co-operative Development (Incorporation) |
| 28/1985 : National Institute of Education |
| 36/1999 : National Institute of Fisheries and Nautical Engineering |
| 12/2010 : National Institute of Labour Studies |
| 26/2007 : National Institute of Language Education and Training |
| 38/2009 : National Institute of Occupational Safety and Health |
| 45/1979 : National Institute of Plantation Management |
| 76/1981 : National Institute of Plantation Management (Amendment) |
| 05/1987 : National Institute of Plantation Management (Amendment) |
| 38/2003 : National Institute of Plantation Management (Amendment) |
| 41/1992 : National Institute of Social Development |
| 59/1998 : National Institute of Technical Education of Sri Lanka (Amendment) |
| 28/2006 : National Insurance Trust Fund |
| 28/2007 : National Insurance Trust Fund (Amendment) |
| 34/2006 : National Kidney Foundation of Sri Lanka (Incorporation) |
| 51/1998 : National Library and Documentation Services Board |
| 05/2015 : National Medicines Regulatory Authority |
| 17/1976 : National Metric Conversion |
| 03/2016 : National Minimum Wage of Workers |
| 16/2021 : National Minimum Wage of Workers (Amendment) |
| 48/2024 : National Minimum Wage of Workers (Amendment) |
| 40/1956 : National Planning Council |
| 44/2011 : National Police Academy |
| 42/1975 : National Prices Commission |
| 11/2016 : National Research Council of Sri Lanka |
| 78/1981 : National Resources, Energy and Science Authority of Sri Lanka |
| 08/1982 : National Savings Bank (Amendment) |
| 33/1987 : National Savings Bank (Amendment) |
| 28/1995 : National Savings Bank (Amendment) |
| 22/1999 : National Savings Bank (Amendment) |
| 30/1971 : National Savings Banks |
| 09/1968 : National Science Council of Ceylon |
| 44/1968 : National Science Council of Ceylon (Amendment) |
| 36/1975 : National Science Council of Sri Lanka |
| 07/1980 : National Science Council of Sri Lanka (Amendment) |
| 11/1996 : National Security Levy (Amendment) |
| 36/1996 : National Security Levy (Amendment) |
| 37/1997 : National Security Levy (Amendment) |
| 17/1998 : National Security Levy (Amendment) |
| 21/1999 : National Security Levy (Amendment) |
| 24/2000 : National Security Levy (Amendment) |
| 04/2001 : National Security Levy (Amendment) |
| 15/2002 : National Security Levy (Amendment) |
| 40/2008 : National Thoroughfares |
| 37/1991 : National Transport Commission |
| 30/1996 : National Transport Commission (Amendment) |
| 06/2017 : National Transport Commission (Amendment) |
| 25/1997 : National Transport Medical Institute |
| 02/1974 : National Water Supply and Drainage Board |
| 13/1992 : National Water Supply and Drainage Board (Amendment) |
| 11/1991 : National Youth Hostel Association Of Sri Lanka (Incorporation) |
| 69/1979 : National Youth Services |
| 41/1982 : National Zoological Gardens |
| 38/1991 : National, Economic, Social, Educational And Cultural Foundation Of Sri Lanka (Incorporation) |
| 16/1999 : Navodaya Foundation (Incorporation) |
| 33/1976 : Navy (Amendment) |
| 24/1986 : Navy (Amendment) |
| 11/1993 : Navy (Amendment) |
| 53/1999 : Navy (Amendment) |
| 32/2011 : Navy (Amendment) |
| 21/1979 : Navy and Air Force (Amendment) |
| 33/2006 : Nawalapitiya Dharul Uloom Al Hashimiya Arabic College (Incorporation) |
| 32/2018 : New Villages Development Authority for Plantation Region |
| 26/1992 : New Young Mens Christian Association – Moratuwa (Incorporation) |
| 05/1976 : Newspapers (Amendment) |
| 25/1983 : Newspapers (Amendment) |
| 23/2014 : Nimal Siripala De Silva Foundation (Incorporation) |
| 30/1968 : Nindagama Lands |
| 45/1988 : North Lanka College Of Medical Practitioners (Incorporation) |
| 18/1968 : Northern Province Teachers’ Association Benevolent Fund (Incorporation) Act |
| 24/1973 : Notaries (Amendment) |
| 20/1976 : Notaries (Amendment) |
| 47/2011 : Notaries (Amendment) |
| 13/2013 : Notaries (Amendment) |
| 31/2022 : Notaries (Amendment) |
| 06/2024 : Notaries (Amendment) |
| 56/1992 : Nugawela Malagammana Rajamaha Viharastha Sanwardhana Sabhawa (Incorporation) |
| 62/1988 : Nursing Homes (Regulation) (Amendment) |
| 63/1988 : Nursing Homes (Regulation) (Amendment) |
| 05/1985 : Nutrition Society of Sri Lanka (Incorporation) |
