| 06/2015 : Madahapola Sri Ratnapalaramaya Religious and Buddhist Educational Development Foundation (Incorporation) |
| 02/2009 : Madampe Thaniwella Maha Devale Trust |
| 23/1999 : Mahanuwara Bauddha Vidya Peetaya (Incorporation) |
| 34/1980 : Mahanuwara Esala Perahera Trust |
| 22/1974 : Mahanuwara Young Men’s Buddhist Association (Incorporation) |
| 52/2007 : Mahanuwara, Asgiriya, Palipana Sri Chandananda Internationl Buddhist Research & Development Centre (Incorporation) |
| 66/1981 : Mahapola Higher Education Scholarship Trust Fund |
| 01/2022 : Mahapola Higher Education Scholarship Trust Fund (Amendment) |
| 48/2000 : Mahara Social Development Foundation (Incorporation) |
| 14/2000 : Maharagama Pamunuwa Sucharithodaya Social Services Society (Incorporation) |
| 29/1986 : Maharagama Samaja Seva Samithi Madhya Mandalaya (Incorporation) |
| 59/1993 : Mahaweli Authority (Amendment) |
| 23/1979 : Mahaweli Authority of Sri Lanka |
| 14/1970 : Mahavali Development Board |
| 03/1976 : Mahaweli Development Board (Amendment) |
| 38/1983 : Mahaweli Development Board (Repeal) |
| 27/2011 : Maheswary Foundation (Incorporation) |
| 75/2009 : Mahindananda Aluthgamage Foundation (Incorporation) |
| 37/1999 : Maintenance |
| 19/1972 : Maintenance (Amendment) |
| 54/1998 : Maintenance Claims (Reciprocal Enforcement) |
| 39/1999 : Maitreya Buddha Dharmadutha Foundation (Incorporation) |
| 52/1988 : Makkiya Arabic College, Galle (Incorporation) |
| 19/1983 : Makola Muslim Orphanage (Incorporation) |
| 22/1985 : Malathion Control |
| 05/2010 : Maligawatta Janaza and Welfare Society (Incorporation) |
| 29/2008 : Malwathu Maha Vihariya Tibbatuwawe Sri Siddhartha Sumangala Benevolent Foundation (Incorporation) |
| 19/1992 : Manafa-Ul-Hudha Arabic College (Incorporation) |
| 06/1963 : Manufacture of Matches (Regulation) |
| 59/1981 : Marine Pollution Prevention |
| 35/2008 : Marine Pollution Prevention |
| 22/1976 : Maritime Zones |
| 39/1993 : Markaz Al Islami- Islamic Center (Incorporation) |
| 19/1999 : Markez Islamic Centre (Incorporation) |
| 18/1995 : Marriage Registration (Amendment) |
| 12/1997 : Marriage Registration (Amendment) |
| 11/2001 : Marriage Registration (Amendment) |
| 36/2006 : Marriage Registration (Amendment) |
| 38/2006 : Marriage Registration (Amendment) |
| 22/2013 : Marriage Registration (Amendment) |
| 42/2024 : Matara Season Organization (Incorporation) |
| 13/1978 : Maternity Benefits (Amendment) |
| 52/1981 : Maternity Benefits (Amendment) |
| 43/1985 : Maternity Benefits (Amendment) |
| 15/2018 : Maternity Benefits (Amendment) |
| 13/1985 : Mawanella Eksath Bauddha Samithiya (Incorporation) |
| 13/1999 : Mawathagama Development Foundation (Incorporation) |
| 38/1956 : Mawathagama Land Acquisition |
| 35/1995 : Measurement Units, Standards and Services |
| 21/2003 : Mediation (Special Categories of Disputes) |
| 09/2016 : Mediation Board (Amendment) |
| 02/2024 : Mediation Board (Amendment) |
| 72/1988 : Mediation Boards |
| 15/1997 : Mediation Boards (Amendment) |
| 04/2011 : Mediation Boards (Amendment) |
| 10/1979 : Medical (Amendment) |
| 23/1985 : Medical (Amendment) |
| 30/1987 : Medical (Amendment) |
| 25/1988 : Medical (Amendment) |
| 13/1993 : Medical (Amendment) |
| 15/1996 : Medical(Amendment) |
| 31/1997 : Medical (Amendment) |
| 33/1997 : Medical (Amendment) |
| 40/1998 : Medical(Amendment) |
| 01/2017 : Medical (Amendment) |
| 28/2018 : Medical (Amendment) |
| 46/2024 : Medical (Amendment) |
| 47/2024 : Medical (Amendment) |
| 06/2014 : Medical (Amendment) Bill |
| 28/1974 : Medical Wants (Amendment) |
| 33/1990 : Medical Wants (Amendment) |
| 53/1993 : Medical Wants (Amendment) |
| 39/1985 : Meegamuwa Bauddha Sadachara Wardhana Samithiya (Incorporation) |
| 02/2007 : Mental Development and Research Center (Incorporation) |
| 52/1971 : Merchant Shipping |
| 36/1988 : Merchant Shipping (Amendment) |
| 17/2019 : Merchant Shipping (Amendment) |
| 03/2006 : Merchant Shipping (Change of Designation) |
| 22/2008 : Methsith Dharmadutha Foundation (Incorporation) |
| 10/1983 : Metric Units (Consequential Provisions) (Amendment) |
| 06/2016 : Microfinance |
| 42/1993 : Middeniya Purana Maha Viharasthanabhiwardhana Sabhawa (Incorporation) |
| 04/1973 : Mines and Minerals |
| 33/1992 : Mines and Minerals |
| 66/2009 : Mines and Minerals (Amendment) |
| 28/2021 : Minimum Retirement Age of Workers |
| 25/2000 : Minimum Wages (Indian Labour) (Amendment) |
| 03/2021 : Minimum Wages (Indian Labour) (Amendment) |
| 31/1970 : Minister of Local Government (Delegation of Powers) |
| 24/1985 : Mirigama Young Men’s Buddhist Association (Incorporation) |
| 40/1985 : Mobilisation and Supplementary Forces |
| 19/1996 : Mobilization and Supplementary Forces(Amendment) |
| 20/2014 : Mohan Lal Grero Foundation(Incorporation) |
| 05/1968 : Monetary Law (Amendment) |
| 21/1968 : Monetary Law (Amendment) |
| 37/1974 : Monetary Law (Amendment) |
| 16/1977 : Monetary Law (Amendment) |
| 14/1979 : Monetary Law (Amendment) |
| 62/1980 : Monetary Law (Amendment) |
| 52/1985 : Monetary Law (Amendment) |
| 07/1988 : Monetary Law (Amendment) |
| 26/1995 : Monetary Law (Amendment) |
| 06/1998 : Monetary Law (Amendment) |
| 32/2002 : Monetary Law (Amendment) |
| 09/2006 : Monetary Law (Amendment) |
| 15/2014 : Monetary Law (Amendment) |
| 27/1987 : Mortgage (Amendment) |
| 03/1990 : Mortgage (Amendment) |
| 20/2024 : Mortgage (Amendment) |
| 15/1980 : Motor Cars (Tax on Transfers) (Amendment) |
| 20/1968 : Motor Traffic (Amendment) |
| 47/1968 : Motor Traffic (Amendment) |
| 22/1973 : Motor Traffic (Amendment) |
| 12/1975 : Motor Traffic (Amendment) |
| 31/1979 : Motor Traffic (Amendment) |
| 21/1981 : Motor Traffic (Amendment) |
| 47/1983 : Motor Traffic (Amendment) |
| 40/1984 : Motor Traffic (Amendment) |
| 08/1990 : Motor Traffic (Amendment) |
| 44/1992 : Motor Traffic (Amendment) |
| 05/1998 : Motor Traffic (Amendment) |
| 08/2009 : Motor Traffic (Amendment) |
| 18/2017 : Motor Traffic (Amendment) |
| 10/2019 : Motor Traffic (Amendment) |
| 60/1979 : Motor Traffic (Special Provisions) |
| 48/1957 : Motor Transport |
| 19/1971 : Motor Transport (Amendment) |
| 36/1973 : Motor Transport (Amendment) |
| 08/1975 : Motor Transport (Amendment) |
| 21/2007 : Muditha Social Service Foundation (Incorporation) |
| 57/1988 : Multilateral Investment Guarantee Agency |
| 38/1973 : Municipal Councils (Amendment) |
| 08/1974 : Municipal Councils (Amendment) |
| 05/1975 : Municipal Councils (Amendment) |
| 18/1979 : Municipal Councils (Amendment) |
| 33/1981 : Municipal Councils (Amendment) |
| 19/1987 : Municipal Councils (Amendment) |
| 35/1987 : Municipal Councils (Amendment) |
| 34/2014 : Muncipal Councils (Amendment) |
| 20/2017 : Municipal Councils (Amendment) |
| 18/1977 : Municipal Councils and Urban Councils (Amendment) |
| 42/1979 : Municipal Councils and Urban Councils (Amendment) |
| 10/1981 : Municipal Councils and Urban Councils (Amendment) |
| 61/1981 : Municipal Councils and Urban Councils (Amendment) |
| 05/1983 : Municipal Councils and Urban Councils (Amendment) |
| 20/1985 : Municipal Councils and Urban Councils (Amendment) |
| 39/1986 : Municipal Councils and Urban Councils (Amendment) |
| 25/1985 : Muslim Development Fund, Sri Lanka (Incorporation) |
| 28/2008 : Muslim Foundation for Culture and Development (Incorporation) |
| 31/1982 : Muslim Ladies Study Circle (Incorporation) |
| 32/1969 : Muslim Marriage and Divorce (Amendment) |
| 40/2006 : Muslim Marriage and Divorce (Amendment) |
| 24/2013 : Muslim Marriage and Divorce (Amendment) |
| 51/1956 : Muslim Mosque and Charitable Trust of Wakfs |
| 34/1983 : Muslim Women’s Social League (Ceylon) (Incorporation) |
| 33/1982 : Muslim Mosques and Charitable Trusts of Wakfs (Amendment) |
| 39/2000 : Mutual Assistance in Civil and Commercial Matters |
| 25/2002 : Mutual Assistance in Criminal matters |
| 24/2018 : Mutual Assistance in Criminal Matters (Amendment) |
