• Mac Liammóir, Micheál, 1, 2, 3, 4, 5
• McBride, Joseph, 1, 2, 3, 4, 5
• McCarey, Leo, 1, 2, 3, 4
• McCarthy, Joseph, 1
• McCormack, Count John, 1, 2
• McCormack, W.J., 1
• McCormick, F.J., 1, 2, 3, 4, 5, 6, 7
  • in Ford’s Plough and the Stars, 1, 2
  • in The Plough and the Stars, 1, 2, 3
• McDermott, Sean, 1
• MacDonald, J. Farrell, 1
• McDonough, J.R., 1, 2
• McDowell, Roddy, 1, 2
• McEldowney, Ken, 1
• MacEntee, Seán, 1
• McGee, Bazie, 1
• McGonigal, Maurice, 1
• McGowran, Jack, 1
• McGrail, Walter, 1
• McGuinness, James Kevin, 1, 2, 3
• McHugh, Michael J., 1
• Macken, Monsignor, Dean of Tuam, 1
• McKenna, Siobhan, 1, 2
• McKenna, Stephen, 1
• McLaglen, Andrew, 1
• McLaglen, Victor, 1, 2, 3, 4, 5, 6, 7
  • The Informer, 1, 2, 3, 4
  • The Quiet Man, 1, 2, 3
• MacNamara, Brinsley, 1, 2, 3, 4
• McNeill, Eoin, 1
• McNeill, James and Mrs, 1
• Madame Butterfly, 1
• Mair, G.H., 1
• Man Who Shot Liberty Valance, The, 1
• Manchester Gaiety, 1
• Manchester Guardian, The, 1
• Manhunt, 1
• Mankiewicz, Joseph L., 1
• Mann, Thomas, 1
• Mann, William J., 1, 2
• Manners, Hartley, 1
• Manning, Mary, 1
• March, Eve, 1
• Margaret Gillan (MacNamara), 1
• Marlborough Street National School, 1
• Marx Brothers, 1
• Mary of Scotland, 1, 2, 3, 4
• Mary Pickford Company, 1
• Masefield, John, 1
• Mason, James, 1
• Massachusetts, 1, 2
• Masses and the Man (Toller), 1
• Maxine Elliott Theatre, NY, 1, 2
• May, Ada, 1
• Mayo, County, 1, 2
• Mehigan, Guy, 1
• Melville, Herman, 1
• Men Without Women, 1
• Merchant Tailors’ School, 1
• Meredith, Bess, 1
• Meredith, Burgess, 1
• Merivale, Gladys and Philip, 1
• Methodism, 1, 2
• Mexico, 1
• MGM Studios, 1, 2, 3, 4, 5, 6
• Miami, 1
• Michigan, 1
• Midway, Battle of, 1, 2
• Milland, Ray, 1
• Miller, Arthur, 1
• Milton, John, 1
• Milwaukee, 1
• Mitchell, Susan, 1
• Mitchell, Thomas, 1 
• Moiseiwitsch, Tanya, 1
• Molloy, J.J., 1
• Molony, Helena, 1, 2
• Monroe, Marilyn, 1
• Monument Valley, Utah, 1
• Moon for the Misbegotten (O’Neill), 1
• Moon in the Yellow River, The (Johnston), 1
• Mooney, Ria, 1, 2, 3, 4, 5, 6, 7
• Moore, George, 1, 2, 3, 4
• Morgan, Sydney, 1, 2
• Morosco Theatre, New York, 1
• Mortished, Marie ‘Bid’ Shields, 1, 2, 3
• Mortished, Una, 1
• Mortished family, 1, 2
• Motion Picture Producers and Distributors Association (MPPDA), 1
• Muckross Park Convent, 1
• Mulhern, Frolie, 1
• Murnau, F.W., 1
• Murphy, Jack, 1
• Murphy, Maurice, 1
• Murray, T.C., 1, 2
• music halls, 1
• My Darling Clementine, 1, 2, 3, 4, 5