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- Malheiro, Agostinho Marques Perdigão 1824-1881
- Malmberg, Aino 1865-1933
- Marks, Percy 1891-1956
- Marquis, Don 1878-1937
- Marsh, George P. (George Perkins) 1801-1882
- Marson, Percival -
- Martí, José 1853-1895
- Martin, Edwin Perry 1922-
- Martin, Percy F. (Percy Falcke) 1861-1941
- Maudslay, Alfred Percival 1850-1931
- McGee, Perry Honce -
- Merrick, W. Percy 1868-
- Mier, Eduardo de 1829-1914
- Moreno, Francisco Pascasio 1852-1919
- Morris, Percy C. -
- Morton, Sarah Wentworth 1759-1846
- Nahl, Perham Wilhelm 1869-
- Nash, Marjorie 1887-1980
- Nebot Pérez, José 1853-1914
- Newberry, Percy E. (Percy Edward) 1869-1949
- Newberry, Perry 1870-1938
- Nilsson, Martin P. (Martin Persson) 1874-1967
- Nobre, António Pereira 1867-1900
- Northumberland, Alan Ian Percy, Duke of 1880-1930
- Obdržálek, Peregrin 1825-1891