| Series | Author | Publication range | # of books in series |
| The Secrets of Droon | Tony Abbott | 1999–2010 | 44 |
| Danny Dunn | Raymond Abrashkin and Jay Williams | 1956–1977 | 15 |
| Happy Families | Allan Ahlberg | 1980– | 21 |
| The Chronicles of Prydain | Lloyd Alexander | 1964–1968 | 5 |
| Aldo Zelnick | Karla Oceanak | 2009–2018 | A to Z; up to M so far |
| Animorphs[1] | K. A. Applegate | 1996–2001 | 54 + 10 spinoffs |
| The Three Investigators | Robert Arthur, Jr. and others | 1964–1987 | 43 + 17 spinoffs |
| Motor Boat Boys | Louis Arundel | 1912–1915 | 7 |
| Crispin | Avi | 2003–2010 | 3 |
| The Railway Series | Wilbert Awdry | 1945–1972 | 26 |
| Christopher Awdry | 1983–2011 | 16 |
| Fluffy Little Kitten | Robert Bassett | 2007–2008 | 4 |
| Beverly Gray | Clair Blank | 1934–1955 | 26 |
| The Berenstain Bears | Stan and Jan Berenstain | 1962–present | 428 |
| Arthur | Luc Besson | 2002–2005 | 4 |
| Sam Hawkins, Pirate Detective | Ian Billings | 2003–2004 | |
| The Travels of Wiglington and Wenks | John Bittleston and Eliza Quek | 1987 | 4 |
| The Famous Five | Enid Blyton | 1942–1963 | 21 |
| The Secret Seven | Enid Blyton | 1949–1963 | 17 + 7 short spinoffs |
| Paddington Bear | Michael Bond | 1958–2018 | 30 + 5 special publications |
| Dave Dawson series | R. Sidney Bowen | 1941–1946 | |
| Red Randall series | R. Sidney Bowen | 1944–1946 | 8 |
| The Last Kids on Earth | Max Brallier | 2015–present | 9 + 5 spinoffs |
| Clifford the Big Red Dog | Norman Bridwell | 1963–2015 | 80 |
| Arthur | Marc Brown | 1976–2011 | 46 |
| Lola Levine | Monica Brown | 2015–2017 | 6 |
| Sarai | Monica Brown | 2018–present | 4 |
| Babar the Elephant series | Jean de Brunhoff and Laurent de Brunhoff | 1931–present | 44 |
| School Friends | Ann Bryant | 2008–2009 | 12 |
| Jennings | Anthony Buckeridge | 1950–1994 | 24 |
| Catfish Bend | Ben Lucien Burman | 1952–1984 | 7 |
| Molly Moon | Georgia Byng | 2002–2012 | 9 |
| Alice | Lewis Carroll | 1865–1871 | 2 |
| Three Thieves | Scott Chantler | 2008–2016 | 7 |
| Henry Huggins | Beverly Cleary | 1950–1963 | 6 |
| Ramona | Beverly Cleary | 1955–1999 | 8 |
| The Magic School Bus | Joanna Cole | 1986–2010 | 13 + 85 spinoffs and extras |
| The Land of Stories | Chris Colfer | 2012–present | 10 |
| Little Bill | Bill Cosby | 1997–1999 | 12 |
| How to Train Your Dragon | Cressida Cowell | 2003–2015 | 12 |
| The Demon Headmaster | Gillian Cross | 1982–2019 | 8 |
| The Animals of Farthing Wood | Colin Dann | 1979–1994 | 8 |
| Dauntless series | James Kerr (as "Peter Dawlish") | 1947–1960 | 8 |
| Alex Archer series | Tessa Duder | 1987–1993 | |
| Tom Swift | Victor Appleton | 1910–1941 | |
| William Dougherty, John Almquist, Richard Sklar, James Duncan Lawrence, Thomas Mulvey and Richard McKenna | 1954–1971 | |
| Bill Rotsler, Sharmon Divono, Neal Barrett, Jr. and Robert E. Vardeman | 1981–1984 | |
| Bill McCay, Steven Grant, F. Gwynplaine MacIntrye, Debra Doyle, James D. Macdonald, Robert E. Vardeman, Bruce Holland Rogers, Bridget McKenna | 1991–1993 | |
| Tom Swift Young Inventor | Victor Appleton | 2006–2007 | 6 |
| Firland | Norman Sandiford Power | 1970–1974 | 3 |
| Matthew Livingston | Marco Conelli | 2007– | |
| The Indian in the Cupboard | Lynne Reid Banks | 1980–1998 | 5 |
| Outernet | Steve Barlow and Steve Skidmore | 2002–2003 | 6 |
| Peter and the Starcatchers | Dave Barry and Ridley Pearson | 2004–2011 | 5 |
| Oz series | L. Frank Baum, Ruth Plumly Thompson, and others | 1900–1920 (Baum); 1921–1963 (others) | 14 |
| Madeline | Ludwig Bemelmans | 1939–1956 | 6 |
| John Bemelmans Marciano | 1999–2013 | 6 |
| The Dark Is Rising Sequence | Susan Cooper | 1965–1977 | 5 |
| Geronimo Stilton | Elisabetta Dami | 1997–present | 84 + 35 spinoffs |
| Amber Brown | Paula Danziger | 1994–2003 | |
| Bruce Coville and Elizabeth Levy | 2012–present | |
| The Hardy Boys | Franklin W. Dixon | 1927–2005 | 58 |
| The Clues Brothers | Franklin W. Dixon | 1997–2000 | 17 |
| The Hardy Boys: Undercover Brothers | Franklin W. Dixon | 2005–2012 | 40 |
| The Hardy Boys Adventures | Franklin W. Dixon | 2013–2023 | 23 |
| The Familiars | Adam Jay Epstein and Andrew Jacobson | 2010–2013 | 4 |
| [Hank the Cowdog#[1]] | John R. Erickson | 1983-current | 82 |
| The Black Stallion | Walter Farley and Steven Farley | 1941–1989 | 21 |
| Père Castor | Paul Faucher | 1933–present | |
| The Great Brain | John D. Fitzgerald | 1967–1995 | 8 |
| The Vanderbeekers | Karina Yan Glaser | 2017–2023 | 7 |
| Just! | Andy Griffiths | 1997–2012 | 9 |
| Raggedy Ann | Johnny Gruelle | 1918–present | 63 |
| Mr. Men | Roger Hargreaves | 1971–1988 | 6 |
| Adam Hargreaves | 1988–present | |
| Little Miss | Roger Hargreaves | 1981–1988 | 13 |
| Adam Hargreaves | 1988–present | |
| Timbuctoo | Roger Hargreaves | 1978–1979 | 25 |
| Beaver Towers | Nigel Hinton | 1980–1997 | 4 |
| Angelina Ballerina | Katharine Holabird | 1983–2021 | 60 |
| Mona the Vampire | Sonia Holleyman | 1990– | 7 |
| Bobbsey Twins | Laura Lee Hope | 1904–1979 | 72 |
| Bunnicula | Deborah Howe and James Howe | 1979–2006 | 7 |
| Oxford Reading Tree | Roderick Hunt and others | 1985–present | 800+ |
| Sugar Creek Gang | Paul Hutchens | 1940–1970 | 36 |
| Redwall | Brian Jacques | 1986–2011 | 22 + 2 picture books |
| Biggles | W. E. Johns | 1932–1999 | 98 + 4 extras |
| The Adventures of the Bailey School Kids | Marcia T. Jones and Debbie Dadey | 1990–2006 | 51 + 33 spinoffs |
| Chrestomanci | Diana Wynne Jones | 1977–2006 | 7 |
| The Guardians of Childhood | William Joyce | 2011–2018 | 5 |
| Nancy Drew Mystery Stories[2] | Carolyn Keene | 1930–2003 | 175 |
| Nancy Drew Diaries | Carolyn Keene | 2013–present | 25 |
| Nancy Drew: Girl Detective | Carolyn Keene | 2004–2012 | 51 |
| The Nancy Drew Files | Carolyn Keene | 1986–1997 | 124 |
| Diary of a Wimpy Kid | Jeff Kinney[3] | 2007–present | 19 |
| Cahills vs. Vespers | Gordon Korman, Jude Watson, Peter Lerangis, Roland Smith, Linda Sue Park and David Baldacci | 2011–2013 | 7 |
| Pelle No-Tail | Gösta Knutsson | 1939–1972 | 12 |
| Mandie | Lois Gladys Leppard | 1983–2004 | 44 |
| The Chronicles of Narnia | C. S. Lewis | 1950–1956 | 7 |
| The Squickerwonkers | Evangeline Lilly | 2013–present | 4 |
| Pippi Longstocking | Astrid Lindgren | 1945–1948 | 16 |
| Sítio do Picapau Amarelo | Monteiro Lobato | 1920–1940 | 23 |
| Doctor Dolittle | Hugh Lofting | 1920–1952 | 15 |
| Superspecial | C. Alexander London | 2016 | 1 |
| Betsy-Tacy | Maud Hart Lovelace | 1940–1955 | 10 |
| The Deep Valley series | Maud Hart Lovelace | 1949–1953 | 3 |
| Tales of the Kingdom Trilogy | David and Karen Mains | 1983–1996 | 3 |
| The Lost Planet | Angus MacVicar | 1953–1964 | 8 |
| The Baby-Sitters Club | Ann M. Martin | 1986–1999 | 146 |
| The Baby-Sitters Club: Mysteries | Ann M. Martin | 1991–1998 | 40 |
| The Baby-Sitters Club: Friends Forever | Ann M. Martin | 1999–2000 | 14 |
| Winnie-the-Pooh | A.A. Milne | 1924–1928 | 2 |
| David Benedictus | 2009 | 2 |
| Anne Shirley series | Lucy Maud Montgomery | 1908–1921 | 8 |
| What-a-Mess | Frank Muir | | 23 |
| The Worst Witch | Jill Murphy | 1974–2018 | 8 |
| Mrs. Coverlet trilogy | Mary Nash | 1961–1965 | 3 |
| Psammead Trilogy | E. Nesbit | 1902–1906 | 3 |
| The Borrowers | Mary Norton | 1952–1982 | 5 |
| Rats of NIMH | Robert C. O'Brien | 1972 | 3 |
| Jane Leslie Conly | 1986–1990 |
| Fancy Nancy | Jane O'Connor | 2005–2013 | 80 |
| The Magic Tree House | Mary Pope Osborne | 1992–present | 67 |
| Abbey Series | Elsie J. Oxenham | 1920–1967 | 38 |
| Vampirina Ballerina | Anne Marie Pace | 2012–2015 | 4 |
| Junie B. Jones | Barbara Park | 1992–2012 | 28 + 3 extras |
| Captain Underpants | Dav Pilkey | 1997–2015 | 12 + 17 spinoffs and extras |
| Peter Rabbit | Beatrix Potter | 1902–2012 | 6 |
| The Nome Trilogy | Terry Pratchett[4] | 1989–1990 | 3 |
| Swallows and Amazons series | Arthur Ransome | 1930–1988 | 12 |
| The Adventures of Tintin | Georges Prosper Remi (as Hergé) | 1929–1976 | 24 |
| Curious George | H.A. Rey and Margaret Rey | 1941–1966 | 7 +61 spinoffs and extras |
| Percy Jackson & the Olympians | Rick Riordan[5] | 2005–2009 | 6 |
| The Heroes of Olympus | Rick Riordan[6] | 2010–2014 | 5 |
| The Kane Chronicles | Rick Riordan | 2010–2012 | 3 |
| Magnus Chase and the Gods of Asgard | Rick Riordan | 2015–present | 3 |
| The Trials of Apollo | Rick Riordan | 2016 | 5 |
| The Clue Hunt | Rick Riordan, Gordon Korman, Peter Lerangis, Jude Watson, Patrick Carman, Linda Sue Park and Margaret Peterson Haddix | 2008–2011 | 11 |
| Harry Potter | J.K. Rowling | 1997–2007 | 7 |
| The Winner's trilogy | Marie Rutkoski | 2014–2016 | 3 |
| Wayside School | Louis Sachar | 1978–2020 | 4 |
| The Little Ghost Godfrey | Inger and Lasse Sandberg | 1965–2005 | 14 |
| Busytown | Richard Scarry | 1994–2000 | |
| I'm a Happy Hugglewug | Niamh Sharkey | 2005–2011 | |
| The Rescuers | Margery Sharp | 1959–1978 | 9 |
| Horrid Henry | Francesca Simon | 1994–present | 24 |
| Oddies | Grant Slater | 2000s | |
| A Series of Unfortunate Events | Lemony Snicket[7] | 1999–2006 | 13 |
| Encyclopedia Brown | Donald J. Sobol | 1963–2012 | 29 |
| Goosebumps[8] | R. L. Stine | 1992–1997 | 62 |
| Tales to Give You Goosebumps | R. L. Stine | 1994–1997 | 6 |
| Give Yourself Goosebumps | R. L. Stine | 1995–2000 | 50 |
| Goosebumps Presents | R. L. Stine | 1996–1998 | 19 |
| Goosebumps Autobiographies | R. L. Stine | 1997–1998 | 2 |
| Goosebumps Triple Header | R. L. Stine | 1997–1998 | 2 |
| Goosebumps Series 2000 | R. L. Stine | 1998–2000 | 27 |
| Goosebumps HorrorLand | R. L. Stine | 2008–2012 | 25 + 2 extras |
| Goosebumps Most Wanted | R. L. Stine | 2012–present | 14 |
| Judy Bolton Mystery Stories[9] | Margaret Sutton | 1932–2012 | 40 |
| The Happy Hollisters | Andrew E. Svenson | 1953–1969 | 38 |
| Anatole | Eve Titus | 1956–1979 | 10 |
| Basil of Baker Street | Eve Titus | 1958–1982 | 8 |
| Cathy Hapka | 2018–2020 |
| Mary Poppins | P. L. Travers | 1934–1988 | 8 |
| Bannerdale series | Geoffrey Trease | 1949–1956 | 5 |
| Blinky Bill | Dorothy Wall | 1933–1934 | 3 |
| The Boxcar Children | Gertrude Chandler Warner | 1924–present | 162 |
| Unstoppable | Jude Watson, Jeff Hirsch, Natalie Standiford and Gordon Korman | 2013–2014 | 4 |
| Doublecross | Jude Watson, C. Alexander London, Jenny Goebel and Sarwat Chadda | 2015–present | 4 |
| Monty the Dog | Colin West | 1989–1996 | 6 |
| Little House on the Prairie | Laura Ingalls Wilder | 1932–1971 | 9 + 1 nonfiction extra |
| Dr. Dee Dee Dynamo | Oneeka Williams | 2013–2018 | 5 |
| Hank Zipzer | Henry Winkler and Lin Oliver | 2003–2010 | 18 |
| Mercer Boys | Albert Capwell Wyckoff | 1929–1933 | 10 |
| Mystery Hunters | Albert Capwell Wyckoff | 1934–1936 | 4 |
| Secret Coders | Gene Luen Yang | 2015–2018 | 6 |