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- Maira Kalman (born 1949) - Max Stravinsky, the poet-dog series
- Ulrich Karger (born 1957) - The Scary Sleepover
- Jan Karon (born 1937) - Miss Fannie's Hat
- Erich Kästner (1899–1974) - Emil and the Detectives, Lottie and Lisa, The Flying Classroom
- Elizabeth Kay - The Divide trilogy
- Annie Keary (1825–1879) - Heroes of Asgarth
- Ezra Jack Keats (1916–1983) - The Snowy Day, Whistle for Willie, Goggles!
- Carolyn Keene - The Nancy Drew mystery series
- Charles Keeping - Charley, Charlotte and the Golden Canary
- Harold Keith (1903–1998) - Rifles for Watie
- Eric P. Kelly (1884–1960) - The Trumpeter of Krakow
- Louise Andrews Kent (1886–1969) - The He went with... series of historical novels
- Judith Kerr - When Hitler Stole Pink Rabbit, The Tiger Who Came To Tea
- P. B. Kerr - Children of the Lamp series
- Dorothy Kilner (1755–1836) - The Life and Perambulation of a Mouse
- Garry Kilworth The Welkin Weasels
- Clive King - Stig of the Dump
- Dick King-Smith (1922–2011) - The Sheep-Pig, The Queen's Nose
- Charles Kingsley (1819–1875) - The Water Babies
- Jeff Kinney - Diary of a Wimpy Kid
- Rudyard Kipling (1865–1936) - Just So Stories, The Jungle Book, Puck of Pook's Hill
- Annette Curtis Klause - Blood and Chocolate
- Anne Knight (1792–1860)
- E. L. Konigsburg - From the Mixed Up Files of Mrs. Basil E. Frankweiler, The View from Saturday
- Conor Kostick - Epic, Saga
- Erik P. Kraft - Chocolatina, Lenny and Mel series, Miracle Wimp
- Ruth Krauss - The Carrot Seed
- Uma Krishnaswami Naming Maya, Monsoon
- Amy Krouse Rosenthal - Duck! Rabbit!
- Joseph Krumgold (1908–1980) - ...And Now Miguel, Onion John
Read more about this topic: List Of Children's Literature Authors