| Kacey, Jennifer | 44 Books | 2 Series |
| Kade, Cyna | 9 Books | 1 Series |
| Kae, Jodi | 7 Books | 1 Series |
| Kallyn, Amber | 27 Books | 5 Series |
| Kammer, Regina | 21 Books | 1 Series |
| Kane | 6 Books | 1 Series |
| Kane, Anne | 67 Books | 6 Series |
| Karland, Marteeka | 196 Books | 9 Series |
| Kat, Chris T. | 24 Books | 1 Series |
| Katt, A.C. | 35 Books | 5 Series |
| Kay, Jani | 17 Books | 3 Series |
| Kelex | 132 Books | 23 Series |
| Kelley, Leah | 10 Books | 1 Series |
| Kelly, Hazel | 39 Books | 8 Series |
| Kelly, Kathleen | 26 Books | 4 Series |
| Kelly, Kiernan | 69 Books | 2 Series |
| Kelly, Kristen | 31 Books | 1 Series |
| Kelly, Marilyn | 6 Books | 1 Series |
| Kemp, Diana | 21 Books | 1 Series |
| Kendricks, K.C. | 67 Books | 4 Series |
| Kenley, Britt | 10 Books | 2 Series |
| Kennedy, Keegan | 136 Books | 1 Series |
| Kenney, Laina | 15 Books | 3 Series |
| Kenney, Rebecca | 5 Books | 1 Series |
| Kenrick, Joanne | 17 Books | 1 Series |
| Kent, Dahlia | 12 Books | 2 Series |
| Kerce, Ruth D. | 39 Books | 6 Series |
| Kersten, Shayla | 23 Books | 1 Series |
| Kincaid, Elena | 18 Books | 4 Series |
| Kincaid, Sadie | 14 Books | 1 Series |
| King, Angelina | 4 Books | 1 Series |
| King, Ann | 25 Books | 1 Series |
| King, Asha | 23 Books | 2 Series |
| King, Lori | 39 Books | 5 Series |
| King, Sam | 6 Books | 1 Series |
| King, Samantha Ann | 3 Books | 1 Series |
| King, Serenity | 25 Books | 3 Series |
| King, Xandra | 6 Books | 1 Series |
| Kingston, Jayne | 10 Books | 2 Series |
| Kingston, Katherine | 29 Books | 3 Series |
| Kingston, Sara | 5 Books | 1 Series |
| Kinkade, Lea | 4 Books | 1 Series |
| Kinlan, Anna | 11 Books | 2 Series |
| Kitts, Tracey H. | 54 Books | 4 Series |
| Klaire, Jamie / Klaire, J.M. | 47 Books | 2 Series |
| Klaire, Jenny | 6 Books | 1 Series |
| Klein, K-Lee | 37 Books | 4 Series |
| Klide, Jessika | 86 Books | 6 Series |
| Knight, Amarantha | 9 Books | 1 Series |
| Knight, Cassiel | 6 Books | 1 Series |
| Knight, Geoffrey | 32 Books | 5 Series |
| Knight, Jayden | 6 Books | 1 Series |
| Knight, Kayla | 4 Books | 1 Series |
| Knox, Kim | 45 Books | 4 Series |
| Kole, Isabella | 25 Books | 2 Series |
| Kolee, S.H. | 7 Books | 1 Series |
| Kollat, Dorothy | 5 Books | 1 Series |
| Kopra, Michelle | 8 Books | 1 Series |
| Kougar, Savanna | 14 Books | 4 Series |
| Kovetz, Lisa Beth | 3 Books | 1 Series |
| Kovit, Kennedy | 4 Books | 1 Series |
| Kraft, Adriana | 58 Books | 1 Series |
| Kreger, Liz | 3 Books | 1 Series |
| Kreig, K.L. | 13 Books | 3 Series |
| Kristen, Natalie | 58 Books | 13 Series |
| Kuefler, T.M. | 42 Books | 3 Series |
| Kulig, Kathy | 24 Books | 2 Series |
| Kyle, Kayce | 7 Books | 2 Series |
| Kyle, Regina | 14 Books | 1 Series |
| Kyndall, Kit | 46 Books | 1 Series |