- Madden, Samuel
- Mael Brigte Mac Tornain
- Mael Isu Ua Brolchain
- Mael Maedoc Ua Morgair
- Mael Mura
- Mael Muire Mac Eachada (Marian)
- Magee
- Magee, James
- Magee, John
- Magee, Martha Maria (nee Stewart)
- Magee, William
- Magee, William Connor
- Magennis, Bernard
- Magennis, Edward
- Magennis, Peter
- Magennis, Peter E.
- Magennis, William
- Magill, Robert
- Maginnis, William Brian
- Maginn, Edward
- Maglone, Barney
- Magrath, George
- Magrath, Miler
- Maguire, Anne
- Maguire, Cathal MacManus
- Maguire, Conor
- Maguire, Cuconnacht
- Maguire, Francis
- Maguire, Hugh
- Maguire, William Henry
- Maguire, William Joseph
- Mahaffy, John Pentland
- Makmie, Francis
- Malachy, St (Mael Maedoc ua Morgair)
- Malby, Nicholas
- Malcolm, Andrew George
- Malcolm Andrew
- Manby, Peter
- Manning, Olivia
- Manson, David
- Mant, Richard
- Marrinan, Padraig
- Marsh, Narcissus
- Marshall, Ann
- Marshall, W.F.
- Martin, George
- Martin, James
- Martin, John
- Martin, Noel
- Martin, Robert Montgomery
- Martin, Samuel
- Massey, William Fergusson
- Maxwell, Arthur
- Maxwell, Hugh
- Maxwell, John
- Maxwell, William
- Maxwell, William Hamilton
- May, Andrew McLean
- May, George Augustus Chichester
- Mayne, Robert Blair
- Mayne, Rutherford
- Mayne, Thomas Ekenhead
- Mayne Reid, Meta
- Mears, John
- Mease, John
- Meenan, James Nahor
- Megaw, Eric Christopher Stanley
- Michelburn, John
- Middleton, Charles Collins
- Middleton, Colin
- Middleton, John
- Midgley, Harold
- Miller, Philip Homan
- Miller, William
- Milligan, Alice
- Milligan, Seaton Forrest
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- Mitchel, Jane (Jenny) (nee Verner)
- Mitchel, John
- Mitchell, Alexander
- Mitchell, Crawford
- Mitchell, William
- Mochaemog, St
- Mochoi, St
- Mochua, St
- Modwenna, St
- Moira, Earl of
- Molaisse (or Lasren), St
- Molines (or Mullen), Allan
- Molloy, Frances
- Molloy, Joseph
- Molua (or Lugidus) St
- Molyneux, Samuel
- Monaghan, John Joseph (Rinty)
- Monck, George
- Monro, Robert
- Monsell, Diana
- Montgomery, Henry
- Montgomery, Henry Riddel
- Montgomery, Hugh c.1623-1663
- Montgomery, Hugh 1871-1954
- Montgomery, Jemima (Tautphoeus, Baroness Von)
- Montgomery, John Wilson
- Montgomery, Leslie Alexander (pseud. Lynn C. Doyle)
- Montgomery, Mary
- Montgomery, Robert
- Montgomery, William
- Monypenny, William Flavel
- Moody, Theodore William
- Moore, Alfred S.
- Moore, Arthur
- Moore, Francis Frankfort
- Moore, Garrett
- Moore, William
- Moore, William Arthur
- Moorhead (Moorehead), Thomas Gillman
- Morant, George Digby
- Morgan, James
- Morris, Henry
- Morrow, George
- Morrow, Harold (pseud. McNamara, Gerald)
- Morton, Mary (May) Elizabeth
- Moryson, Fynes
- Moryson, Richard
- Moyes, James
- Muircheartach Mac Ercae
- Muirchu, St
- Mulcaghy, Matt (Guy, Wilson)
- Muldoon, John
- Mulholland, Andrew
- Mulholland, Clara
- Mulholland, John
- Mulholland, Rosa (pseud. Ruth Murray)
- Mullan, David
- Mulligan, Sylvester
- Mullin, James
- Mulvaney, John Skipton
- Munro, Henry
- Mura, St
- Murnaghan, Sheelagh Mary
- Murphy, Edward Sullivan
- Murphy, Gerard
- Murphy, James Gracy
- Murphy, Joseph John
- Murphy, Patrick
- Murray, James 1788-1871
- Murray, James 1831-1863
- Murray, John
- Murray, John Fisher
- Murray, Laurence Patrick (Lorcan O Muireadhaigh)
- Murray, Patrick Anthony
- Musgrave, James
- Mushett, William
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