- M. Campbell & Co
- M.C. Mackenzie & Sons Pty Ltd.
- MacDonald, George James (1803 - 1851)
- Macdonald, John, Mackenzie, Lindsay (1842 - 1937), Grazier
- Macgregor, Peter
- Macinnis-Macintyre Family
- Mack, Rawdon
- Mackay Daily Mercury [Newspaper]
- Mackay Family
- MacKay, Huntly Brodie (c. 1858 - 1891)
- Mackay, John (1839 - 1914)
- Mackenzie Family
- Mackinnon, John
- Macleay River Co-Operative Dairying Company
- Macleay River Historical Society
- Macneil, Peter
- Magick's Store
- Mahon & Headly Pty Ltd (1912 - 1930s)
- Mallam, Henry Adrian (1933 - 1997)
- Mallyon, Frank
- Manchester Unity Independent Order of Oddfellows, Nundle
- Manchester Unity Independent Order of Oddfellows, Nyngan
- Manchester Unity Independent Order of Oddfellows, Tenterfield
- Manchester Unity Independent Order of Oddfellows Loyal Lodge, Armidale
- Manilla R.S.L & Ex-Servicemen's Club Ltd
- Manning River Times [Newspaper]
- Markham, George (c. 1822 - 1864)
- Marrar Parish, Anglican Diocese of Riverina
- Marsh, Charles William
- Marsh, Matthew Henry ( - c. 1881)
- Maryland Station
- Masonic Lodge
- Masonic Lodge, Wauchope
- The Masonic Lodge, Murrumbidgee Daylight No 1002 and the Masonic Lodge Chapter of the Royal Arch No 27
- Massey, James
- Massey, Stan
- Mates Northside Shopping Centre (c. 1980 - )
- Mathews & Danger
- Mathoura Parish, Anglican Diocese of Riverina
- May Day Committee, Wollongong (1935 - 1970), Wollongong May Day Committee
- Mayer, Henry (1919 - 1991)
- Mayne, Thomas Kenneth Bartle (1852 - 1894)
- Mayson, Alfred Threkeld
- Mayvale Station
- McCaffrey, Frances (1865 - 1932)
- McCarthy, William John Patrick [Bill] (1923 - 1987)
- McDouall Family
- McEwen, Ellen M.
- McGee, A.A.
- McGlinchey, Peter
- McIntyre, Mrs. Eleanor (nee Broun), Catherine Mary Emily Broun & Honora Kelly
- McKay, Lewis George
- McKay, Stewart
- McKenzie Family
- McKenzie, Malcolm M
- McKinnon, John
- McLaurin Family
- McLennan Family
- McLennan, Roderick ( - 1893)
- McLennan, William J
- McPherson, Herbert John [Herb] (1917 - )
- McPherson, Mrs A.
- McRae, Duncan (1837 - 1930)
- McSpedden's Hardware & Produce Store
- Meillon, Mary
- Mendelsohn, Ronald S.
- Menindee Parish, Anglican Diocese of Riverina
- Merrigal Station
- Merrylees, Dr W.A.
- Merungle Hill Progress Association
- Merungle Hill Public School Parents & Citizens' Association
- Messrs Carley Bros
- Metal Manufacturers Ltd (1916 - 1980)
- Metal Trades Council, Newcastle (1933 - 1937)
- Metal Trades Federation (1948 - 1969)
- Mid-Coast Co-op Meat Society Ltd
- Miles and Russell
- Milford, Frederick (c. 1832 - 1902)
- Millwood Road Branch, Farmers and Settlers' Association of New South Wales
- Milthorpe Branch, Farmers' and Settlers' Association
- Mimosa Branch, Farmers' and Settlers' Association
- Miners Federation, Australian Coal and Shale Employees Federation (1916 - 1990)
- Miners Friend Lodge, Balgownie, Grand United Order of Oddfellows (1904 - 1937)
- Miners Womens Auxiliaries of Australia; Southern District, New South Wales (1938 - 2000)
- Miss Wagga Wagga Quest (1946 - )
- Mitchell Academics' Union, Charles Sturt University - Bathurst
- Mitchell College Academic Staff Association
- Mitchell College of Advanced Education (1971 - 1989)
- Mitchell Graduates' Association
- Mitchell, Winifred
- Moama Parish, Anglican Diocese of Riverina
- Moffatt, Josias Sleeman (1835 - 1908)
- Mogila Station
- Moloney's General Store
- Moree and adjacent districts
- Moree Branch, United Farmers and Wool-Growers Association
- Morgan, Jane
- Morgan, John
- Morris, Alma
- Morrison Family
- Morse Family
- Mortimer, Hendriks, Griffin & Erratt
- Morton Plains Station
- Morundah Parish, Anglican Diocese of Riverina
- Morundah Public School Parents and Citizens' Association
- Moseley Family
- Moseley, Mary Alice (1855 - 1945)
- Mossgiel Station
- Moulamein Parish, Anglican Diocese of Riverina
- Mount Kembla Branch, Australian Labor Party (1951 - 1974)
- Mount Pleasant Coal Company Limited
- Mount Saint Thomas Planning & Preservation Group
- Movement Against Uranium Mining, Armidale
- Moyes, John Stoward (1884 - 1972)
- Mrrulebale Station
- Muggleton, Robert Alexander (1874 - 1955)
- Mullen, William Henry (1833 - c. 1915)
- Mulligan, John
- Mulligan, Robert
- Mulwala Station
- Murraguldrie Station
- Murray Darling Association Inc
- Murray Valley Development League (1944 - )
- Murray Valley New State Proposal
- Murray, Andrew
- Murray-Prior Family
- Murrumbidgee Co-operative Milling Co Ltd (1890 - 2000)
- Murrumbidgee Pastoral and Agricultural Association (1884 - 1961)
- Murrumbidgee Pastoral Association (1864 - 1884)
- Murrumbidgee Regional Development Committee (1945 - )
- Murrumbidgerie Station
- Murrurundi Historical Society
- Murwillumbah, Banana Growers Federation (1918 - )
- Myall Creek Station (c. 1834 - )
- Mylne, Graham (Junior)
- Mylne, Graham (Senior)
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