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| — M — |
| Amin Maalouf | K. W. MacAnn | Bonnie MacBird | Gary D. MacClellan | John D MacDonald |
| Antonio Machado | Norman L. Macht | Enrique Machuca | Sergio Macías García | R. W. Mackelworth |
| Edward Mackin | Sarah MacLean | Frank MacShane | Tom Maddox | Elliot S. Maggin |
| Elisabeth Malartre | Massimiliano Malerba | George Malko | César Mallorquí | Roberto Malo |
| Thomas Malory | Barry N. Malzberg | David Mancera | Paco Mancera | Avro Manhattan |
| Laurence Manning | Marcos Manrique | Julio O. Manzo | José Ángel Mañas | Laura S. Maquilón |
| Santiago Marchese Flórez | Óscar de Marcos Escriña | Marco Antonio Marcos Fernández | Daniel Mares | Fernando Marías |
| Rafael Marín | Winston K. Marks | Louise Marley | Carlos Francisco Márquez Linares | Sergio Mars |
| Blanca Mart | Bertil Martensson | María Antonia Martí Escayol | Félix Martí Ibáñez | Carlos Martí Mezquita |
| George R. R. Martin | Miguel Martín Cruz | Javier Martín Lalanda | Luis Martín Santos | Santiago Martín Subirats |
| A. V. Martinet | Abel Martínez | Blanca Martínez | F. J. Martínez | Felicidad Martínez |
| Layla Martínez | Rodolfo Martínez | Sebastián Martínez | Ismael Martínez Biurrun | Carlos M. Martínez Bouquet |
| Carlos Martínez Córdoba | Ignacio Martínez de Pisón | Cristina Martínez García | José Martínez Moreno | Sergio Martínez Mourelle |
| Javier Martos | Groucho Marx | Luca Masali | John Masefield | David Mateo |
| Alfonso Mateo-Sagasta | Carlos Mateos López | Miguel Matesanz | Richard Matheson | David Matusek |
| Karl May | Iván Mayayo | Bruce McAllister | Paul J. McAuley | Sally McBride |
| Anne McCaffrey | Roy L. McCardell | Cormac McCarthy | Jack McDevitt | Anson McDonald |
| Ian McDonald | Ian McDowell | J. T. McIntosh | Will McIntosh | Vonda McIntyre |
| Dave McKean | Suzy McKee Charmas | Patricia A. McKillip | Dean McLaughlin | Alistair McLean |
| Ángel Medina | S. P. Meek | Ib Melchior | Paul Melko | Felipe Mellizo |
| Herman Melville | David Mendaña | Magín Méndez Sanguos | Plinio Apuleyo Mendoza | José Ángel Menéndez Lucas |
| Arturo Mengotti | Guera Mengotti | A. J. Merak | José María Merino | Judith Merril |
| Abraham Merrit | Carlos Mesa | J. G. Mesa | Nicholas Meyer | Gustav Meyrink |
| Melisa Michaels | Gilbert Michel | James A. Michener | Alejandro Mier | China Mieville |
| Hernán Migoya | John Milius | P. Schuyler Miller | Walter M. Miller Jr. | John Milton |
| Teresa P. Mira de Echeverría | Alberto Miralles | Iván Miras | Javier Miró | Margaret Mitchell |
| Laura J. Mixon | Manuel Miyares | Judith Moffet | Moisés | Manuel Moledo |
| Iván Molina Jiménez | Alfons Moliné | H. W. Mommers | Pedro Monje | Indro Montanelli |
| Amparo Montejano | Javier Montellano | José María Montells | Rosa Montero | Manuel Montes |
| Raúl Montes de Oca | Ricardo Montesinos | Ricardo Montesinos Valentín | Sandra Monteverde Ghuisolfi | Enrique Montiel de Arnaíz |
| Michael Moorcock | Catherine L. Moore | Raylyn Moore | Víctor Mora | Didac Morales |
| Carla C. Moreno | Carmen Moreno | Fernando Ángel Moreno | Joaquín Moreno | Manuel Moreno Bellosillo |
| Sergio Moreno Montes | Silvia Moreno-García | Chris Morgan | Richard Morgan | Nieves Mories |
| Grant Morrison | James Morrow | William Chambers Morrow | Pedro Antonio Moscatel Gómez | Sam Moskowitz |
| Erick J. Mota | Magdalena Moujan Otaño | Dennis Mourdoch | Manuel Moyano | Slawomir Mrozek |
| H. Warner Munn | Jorge Munnshe | Miguel Ángel Muñoz | Óscar Muñoz | Ramón Muñoz |
| Óscar Muñoz Caneiro | Julián Muñoz Carrasco | Vicente Muñoz Puelles | Juan Jacinto Muñoz Rengel | Pedro Muñoz Seca |
| Rafael Muñoz Vega | José Luis Muñoz Villar | Pat Murphy | William Murray |
