- Maas, Sarah J.
- Maberry, Jonathan
- MacAlister, Katie
- Macauley, Robie
- MacDonald, George
- MacHale, D. J.
- Machen, Arthur
- MacIsaac, Fred
- Mack, David
- MacKay, Nina
- MacKenzie, Ross
- MacLeod, Bracken
- MacLeod, Ian R.
- MacLeod, Ken
- Macneal, Elizabeth
- MacNiven, Robbie
- Macri, Thomas
- Maddox, Tom
- Maehrer, Hannah Nicole
- Mafi, Tahereh
- Maggs, Sam
- Magrs, Paul
- Maguire, Gregory
- Mahanenko, Vasily
- Mahlow, Christian
- Mahr, Daphne
- Maibach, Juliane
- Maikranz, D. Eric
- Maine, Charles Eric
- Major, Heike M.
- Malerman, Josh
- Malfi, Ronald
- Malzberg, Barry N.
- Mamatas, Nick
- Mamczak, Sascha
- Mammay, Michael
- Mancour, T. L.
- Mancusi, Mari
- Mandanna, Sangu
- Mangels, Andy
- Mangin, Loïc
- Maniac, Marco
- Maniscalco, Kerri
- Mann, George
- Mann, Phillip
- Manning, Michael
- Manoukian, Stan
- Marano, Michael
- Marasco, Robert
- Marc, John
- Marcus, Ben
- Maresca, Marshall Ryan
- Marewski, Nina Maria
- Marie, Annette
- Marillier, Juliet
- Marion, Isaac
- Marković, Barbi
- Marley, Louise
- Marmell, Ari
- Marques, Rafael
- Marrak, Michael
- Marrs, John
- Mars, Liane
- Marsh, Richard
- Marshall, Alex
- Marshall, Kate Alice
- Marske, Freya
- Martell, Nick
- Martin, Alicia S.
- Martin, Gail
- Martin, George R. R.
- Martin, Jack
- Martin, Michael A.
- Martin, Nina
- Martin, Tom
- Martine, Arkady
- Martinez, A. Lee
- Marusek, David
- Marzi, Christoph
- Masello, Robert
- Mason, Willow
- Masters, Louisa
- Masterton, Graham
- Matharu, Taran
- Mather, Mather
- Matheson, Richard
- Mathison, Dirk
- Mattfeldt, Petra
- Matthews, John
- Maurer, Matthias
- Maxey, James
- Maxwell, Everina
- Maxwell, Lisa
- May, Jackie
- May, Julian
- May, Nina F.
- May, Tessa
- Mayer, Claudia
- Mayer, Shannon
- Mayerhofer, Jacqueline
- Mayonga, David
- Mayr, Ralph
- McBean, Brett
- McBride, Michael
- McCabe, Sean
- McCaffrey, Anne
- McCammon, Robert R.
- McCarten, Anthony
- McCarthy, Wil
- McCay, Bill
- McClellan, Brian
- McCollum, Michael
- McCormack, Una
- McCurdy, Janelle
- McDermott, Andy
- McDermott, Kirstyn
- McDevitt, Jack
- McDonald, Ed
- McDonald, Ian
- McDonnell, C. K.
- McDowell, Michael
- McEntire, Myra
- McFall, Claire
- McGann, Oisín
- McGarry, Terry
- McGeorge, Chris
- McGerran, David
- McGonigal, Jane
- McGrew, Chandler
- McGuire, Seanan
- McIlwaine, Catherine
- McIntee, David A.
- McIntire, Emily
- McIntosh, Fiona
- McIntyre, Gina
- McIntyre, Vonda N.
- McKenzie, Shane
- McKiernan, Dennis L.
- McKillip, Patricia A.
- McKinney, L. L.
- McLaughlin, Rebecca
- McLean, Peter
- McMullen, Sean
- McNeill, Graham
- McQuay, Mike
- Mead, Richelle
- Meaney, John
- Mebus, Scott
- Meier, Christian J.
- Meier, Dominik A.
- Meikle, William
- Meiser, Michael
- Meister, Marion
- Meißner, Tobias O.
- Melchiorri, Anthony J.
- Melko, Paul
- Mellick III, Carlton
- Melling, Nora
- Melneczuk, Stefan
- Meluch, R. M.
- Melville, Corinna
- Melzer, Brigitte
- Menapace, Jeff
- Mennigen, Peter
- Menold, Marcus
- Menschig, Diana
- Mer, Lilach
- Merle, Robert
- Merow, Alexander
- Merritt, Abraham
- Merten, Peter
- Mertens, J.
- Messenger, Shannon
- Mette, Michael
- Metzen, Chris
- Metzger, Christian
- Meyer, J. P.
- Meyer, Joseph A.
- Meyer, Kai
- Meyer, Marissa
- Meyer, Olivia
- Meyer, Scott
- Meyer, Stephenie
- Mi-ye, Lee
- Michaelis, Antonia
- Mielke, Lars
- Miesen, Georg
- Mikati, Gitta
- Mikuta, Zoe Hana
- Mildes, Denise
- Millar, Martin
- Miller jr., Walter M.
- Miller, Anika
- Miller, Frank
- Miller, John Jackson
- Miller, Karen
- Miller, Laura
- Miller, Madeline
- Miller, Matthew
- Millwood Hargrave, Kiran
- Miloszewski, Zygmunt
- Milán, Greta
- Mira, Aiki
- Miro, J. M.
- Mirow, Benedict
- Mirrlees, Hope
- Mitchell, David
- Mitchell, V. E.
- Miéville, China
- Modesitt, L. E.
- Moers, Walter
- Moldavsky, Goldy
- Molitor, Jeannine
- Molles, D. J.
- Moloney, Susie
- Mon, Mika D.
- Monchinski, Tony
- Moncrieff, J. H.
- Monette, Sarah
- Moning, Karen Marie
- Monkberg, Angelika
- Monteleone, Thomas F.
- Montemurri, Jacqueline
- Montgelas, Max J.
- Montillon, Christian
- Moody, David
- Moon, Elizabeth
- Moorcock, Michael
- Moore, Alan
- Moore, C. L.
- Moore, Christopher
- Moore, James A.
- Moore, John
- Moore, Stuart
- Moore, Ward
- Moorhead, S. E.
- Moram, Warda
- Moreci, Michael
- Morehouse, Lyda
- Moreland, Brian
- Moreno-Garcia, Silvia
- Morgan, Audrey
- Morgan, Chris
- Morgan, Kass
- Morgan, Lara
- Morgan, Lily S.
- Morgan, Richard
- Morgan, Robert
- Morgenstern, Erin
- Morger, Fabia
- Moriarty, Chris
- Morpuss, Guy
- Morrell, David
- Morris, Brandon Q.
- Morris, Janet
- Morris, Jonathan
- Morris, William
- Morwood, Peter
- Mosmann, Daniel
- Mosse, Kate
- Motayne, Maya
- Mottram, James
- Mrugowski, Jasmin
- Much, Holger
- Muir, Tamsyn
- Mulford, A. K.
- Mull, Brandon
- Mulligan, Shane
- Munda, Rosaria
- Murakami, Haruki
- Murray, Andrew Hunter
- Murray, Will
- Musk, Justine
- Muskat, Lena
- Myers Sain, Ginny
- Myers, Benjamin J.
- Myers, Eugene
- Möhlmann, Roman
- Mösch, Matthias
- Mühlenhaupt, Stefanie
- Müller, Asta
- Müller, Fabian
- Müller, Sebastian
- Müller, Xavier
- Müller-Braun, Dana
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