| M'Lady, K.A. | 27 Books | 3 Series |
| Mactire, Jake | 2 Books | 1 Series |
| Maddison, Karly | 14 Books | 1 Series |
| Maddix, Marina | 15 Books | 2 Series |
| Madison, Mia | 36 Books | 3 Series |
| Madison, Robie | 8 Books | 1 Series |
| Madore, Nancy | 11 Books | 3 Series |
| Maggy, Tammy Dennings | 8 Books | 1 Series |
| Mahoney, Gabriella | 27 Books | 4 Series |
| Maise, Ella | 10 Books | 1 Series |
| Maitland, Kaitlin | 33 Books | 2 Series |
| Malick, Lena | 5 Books | 1 Series |
| Malkin, Ashley | 24 Books | 4 Series |
| Malone, Josie | 14 Books | 2 Series |
| Malone, Mia | 15 Books | 4 Series |
| Maltese, William | 93 Books | 1 Series |
| Mancini, Jennifer | 8 Books | 1 Series |
| Manly, D.J. | 173 Books | 4 Series |
| Mann, Marilu | 10 Books | 1 Series |
| Mansfield, Maxine | 10 Books | 1 Series |
| Mansfield, Wayne | 78 Books | 1 Series |
| Mar, Chalee | 1 Book | 1 Series |
| Marcel, Zoey | 28 Books | 6 Series |
| March, Ava | 22 Books | 4 Series |
| Marcus, A.J. | 36 Books | 5 Series |
| Marie, Kay | 11 Books | 3 Series |
| Marie, Laura | 11 Books | 2 Series |
| Marie, Lisa | 12 Books | 2 Series |
| Marks, Rena | 75 Books | 9 Series |
| Marlow, Shaye | 19 Books | 4 Series |
| Marlow, Trinity | 12 Books | 3 Series |
| Marlowe, Sage | 31 Books | 4 Series |
| Marquette, April Alisa | 7 Books | 1 Series |
| Marquis, Michelle; Bayer, Lindsey | 11 Books | 1 Series |
| Marsh, Sarah | 15 Books | 2 Series |
| Marshall, Grace | 7 Books | 1 Series |
| Marshall, Sasha | 10 Books | 1 Series |
| Marsters, Cat | 21 Books | 1 Series |
| Martens, Dawn | 27 Books | 3 Series |
| Martin, Madelene | 20 Books | 1 Series |
| Martin, S.R. | 17 Books | 1 Series |
| Martin, Sophie | 15 Books | 4 Series |
| Martin, Teya | 5 Books | 1 Series |
| Martine, Missy | 17 Books | 5 Series |
| Martins, Melanie | 11 Books | 2 Series |
| Marx, Locklyn | 9 Books | 1 Series |
| Mason, Jude | 54 Books | 1 Series |
| Mason, Marie | 7 Books | 2 Series |
| Mason, Renea | 13 Books | 2 Series |
| Massa, J.J. | 37 Books | 1 Series |
| Masters, India | 16 Books | 1 Series |
| Masters, J.J. | 5 Books | 1 Series |
| Masters, Kallypso | 18 Books | 4 Series |
| Masters, Zenina | 75 Books | 5 Series |
| Mathews, Robert | 25 Books | 3 Series |
| Matilde, Sibylla | 10 Books | 1 Series |
| Matthews, A.J. | 29 Books | 2 Series |
| Matthews, Elena | 9 Books | 1 Series |
| Matthews, Lissa | 55 Books | 2 Series |
| Maxwell, Madison | 1 Book | 1 Series |
| Maxwell, Mardi | 14 Books | 2 Series |
| Maxwell, Megan | 3 Books | 1 Series |
| May, Jenna | 1 Book | 1 Series |
| Mayne, Xavier | 10 Books | 1 Series |
| McAvoy, Bridy | 125 Books | 5 Series |
| Mcbride, Belinda | 41 Books | 2 Series |
| McCade, Cole | 11 Books | 2 Series |
| McCall, B.J. | 78 Books | 5 Series |
| McClive, Kayelle | 3 Books | 1 Series |
| McCoy, Nikki | 12 Books | 2 Series |
| McCoy, Samantha | 18 Books | 1 Series |
| McCoy, Sky | 55 Books | 7 Series |
| McDonald, Denise Belinda | 8 Books | 1 Series |
| McDonald, J.B. | 16 Books | 1 Series |
| McEntire, D. | 17 Books | 2 Series |
| McEwen, Gail; Moncton, Tina | 3 Books | 1 Series |
| McIntyre, Anna J. | 10 Books | 3 Series |
| McKeever, Gracie C. | 29 Books | 3 Series |
| McKenna, Claire | 3 Books | 1 Series |
| McKenna, Harley | 1 Book | 1 Series |
| McKenna, J.W. | 11 Books | 1 Series |
| McKenzie, Cooper | 109 Books | 17 Series |
| McKnight, Ava | 28 Books | 2 Series |
| McLain, Molly | 25 Books | 4 Series |
| McLane, C.J. | 8 Books | 2 Series |
| McLeod, Anitra Lynn | 105 Books | 12 Series |
| McLeod, Kayden | 16 Books | 1 Series |
| McNeely, Rachel | 16 Books | 1 Series |
| McTark, Moira | 8 Books | 1 Series |
| McTavish, Grae | 4 Books | 1 Series |
| Meade, S.A. | 11 Books | 1 Series |
| Meador, Minnette | 8 Books | 2 Series |
| Meadowes, Holly | 7 Books | 2 Series |
| Medina, Marie | 90 Books | 15 Series |
| Meilleur, Toni L. | 20 Books | 3 Series |
| Meinel, K'Anne | 132 Books | 3 Series |
| Mello, Alison | 18 Books | 4 Series |
| Melton, Keith | 7 Books | 3 Series |
| Mercury, Karen | 33 Books | 7 Series |
| Merrow, J.L. | 76 Books | 5 Series |
| Meyer, Honey | 16 Books | 2 Series |
| Michael, Sean | 405 Books | 32 Series |
| Michaels, Bethany | 27 Books | 3 Series |
| Michaels, Brien | 9 Books | 1 Series |
| Michaels, Cadence | 10 Books | 3 Series |
| Michaels, D.J. | 4 Books | 2 Series |
| Michaels, Lydia | 51 Books | 9 Series |
| Michaels, Lydia; Young, Allyson | 3 Books | 1 Series |
| Michaels, Marisa | 37 Books | 5 Series |
| Michaels, Quinn | 7 Books | 1 Series |
| Michaels, Skye | 33 Books | 6 Series |
| Michaels, T.J. | 31 Books | 4 Series |
| Michaels, Tere | 19 Books | 1 Series |
| Michaelson, Zane | 40 Books | 5 Series |
| Michele, Ryan; Camaron, Chelsea | 9 Books | 2 Series |
| Midway, Bridget | 31 Books | 1 Series |
| Millar, Mina | 7 Books | 1 Series |
| Miller, Cait | 6 Books | 1 Series |
| Miller, Robin Leigh | 14 Books | 1 Series |
| Mimi, Screaming | 22 Books | 2 Series |
| Ming, Silke | 24 Books | 5 Series |
| Mint, Cassie | 35 Books | 6 Series |
| Mirin, Christelle | 15 Books | 2 Series |
| Mistry, Mahi | 11 Books | 2 Series |
| Mitchell, K.A. | 29 Books | 4 Series |
| Mitchell, Kennedy L. | 30 Books | 4 Series |
| Mitchell, Morgan Jane | 37 Books | 5 Series |
| Moler, A.R. | 79 Books | 4 Series |
| Moncrief, Skhye | 23 Books | 4 Series |
| Monet, Rae | 15 Books | 1 Series |
| Monroe, Ashlynn | 109 Books | 10 Series |
| Monroe, Marla | 134 Books | 18 Series |
| Monroe, Melody Snow / Monroe, Melody S. | 44 Books | 6 Series |
| Montague, Autumn | 8 Books | 1 Series |
| Montague, Madelaine | 32 Books | 1 Series |
| Monteau, Tamara | 7 Books | 1 Series |
| Montgomery, Dawn | 21 Books | 1 Series |
| Montgomery, Evelyn | 18 Books | 1 Series |
| Moon, Clarrissa Lee | 8 Books | 1 Series |
| Moon, Kele | 13 Books | 3 Series |
| Moore, Elsie | 5 Books | 1 Series |
| Moore, Gigi | 6 Books | 2 Series |
| Moore, J.L. | 4 Books | 1 Series |
| Moore, Natasha | 40 Books | 4 Series |
| Morgan, Aishling | 32 Books | 1 Series |
| Morgan, Alex (1) | 21 Books | 2 Series |
| Morgan, Darcie | 4 Books | 1 Series |
| Morgan, Millie | 16 Books | 3 Series |
| Morgan, Nicole | 51 Books | 4 Series |
| Morgan, Sage L. | 50 Books | 2 Series |
| Morgan, Teresa | 11 Books | 1 Series |
| Morgen, Shelby | 47 Books | 2 Series |
| Morin, Isabel | 10 Books | 2 Series |
| Moss, Tragen | 5 Books | 1 Series |
| Mowbray, Sorcha | 25 Books | 3 Series |
| Munro, Shelley | 148 Books | 18 Series |
| Munroe, Jett | 1 Book | 1 Series |
| Munton, Melanie | 31 Books | 6 Series |
| Murphy, Christine | 15 Books | 1 Series |
| Murphy, Fiona | 37 Books | 7 Series |
| Murray, Clare | 7 Books | 1 Series |
| Myers, A.M. | 16 Books | 3 Series |
| Mykles, Jet | 49 Books | 6 Series |
| Myles, Josephine | 22 Books | 1 Series |