| 432 EN | O'Diddy | Stevenson, Jocelyn | 3.7 | 1.0 |
| 28870 EN | Oceans (Closer Look At) | Smart, Brian Hunter | 6.6 | 1.0 |
| 31760 EN | Octopuses (Ocean Life) | Schaefer, Lola M. | 1.5 | 0.5 |
| 46287 EN | Odysseus in the Serpent Maze | Yolen/Harris | 5.0 | 7.0 |
| 24048 EN | Off-Road Truck Racing (MotorSports) | McAuliffe, Bill | 4.5 | 0.5 |
| 332 EN | Oh, Brother | Wilson, Johnniece | 3.9 | 4.0 |
| 31586 EN | Oh, Cats! | Buck, Nola | 0.4 | 0.5 |
| 901412 EN | Oh, Cats! (SF Edition) | Buck, Nola | 1.1 | 0.5 |
| 433 EN | Oh Honestly, Angela! | Robinson, Nancy | 3.7 | 2.0 |
| 77848 EN | Oh, Look! | Polacco, Patricia | 2.1 | 0.5 |
| 9038 EN | Oh Say Can You Say? | Seuss, Dr. | 4.0 | 0.5 |
| 65309 EN | Oh Say Can You Say Di-no-saur? All About Dinosaurs | Worth, Bonnie | 3.0 | 0.5 |
| 62257 EN | Oh Say Can You Seed? | Worth, Bonnie | 3.7 | 0.5 |
| 15530 EN | Oh, the Places He Went: A Story About Dr. Seuss | Weidt, Maryann N. | 5.8 | 1.0 |
| 9039 EN | Oh, the Places You'll Go! | Seuss, Dr. | 3.3 | 0.5 |
| 62258 EN | Oh, the Things You Can Do That Are Good for You! | Rabe, Tish | 3.6 | 0.5 |
| 9040 EN | Oh, the Thinks You Can Think! | Seuss, Dr. | 1.8 | 0.5 |
| 2017 EN | Ohio Facts and Symbols | McAuliffe, Emily | 3.6 | 0.5 |
| 42054 EN | Oklahoma Facts and Symbols | Gibson, Karen Bush | 4.2 | 0.5 |
| 70113 EN | Old Cricket | Wheeler, Lisa | 4.0 | 0.5 |
| 901559 EN | Old Gollywampus (SF Edition), The | Speed, Toby | 2.5 | 0.5 |
| 5323 EN | Old Motel Mystery, The | Warner, Gertrude Chandler | 4.0 | 2.0 |
| 65 EN | Old Mother West Wind | Burgess, Thornton | 5.2 | 3.0 |
| 18899 EN | Old People, Frogs, & Albert | Wilson, Nancy Hope | 3.3 | 1.0 |
| 66 EN | Old Yeller | Gipson, Fred | 5.0 | 5.0 |
| 71432 EN | Olive's Ocean | Henkes, Kevin | 4.7 | 4.0 |
| 7336 EN | Oliver | Hoff, Syd | 2.1 | 0.5 |
| 333 EN | Oliver Dibbs and the Dinosaur Cause | Steiner, Barbara | 4.3 | 5.0 |
| 284 EN | Oliver Dibbs to the Rescue! | Steiner, Barbara | 4.0 | 4.0 |
| 7116 EN | Oliver Twist | Dickens, Charles | 11.3 | 33.0 |
| 44266 EN | Olivia | Falconer, Ian | 2.0 | 0.5 |
| 72911 EN | Ollie | Dunrea, Olivier | 0.9 | 0.5 |
| 901196 EN | Olympics (SF Edition) | Sparks, Stacey | 4.2 | 0.5 |
| 28294 EN | Omega Network, The | Locke, Thomas | 5.1 | 12.0 |
| 65310 EN | On Beyond Bugs! All About Insects | Rabe, Tish | 3.6 | 0.5 |
| 9041 EN | On Beyond Zebra | Seuss, Dr. | 4.2 | 0.5 |
| 12839 EN | On Heroes and the Heroic: In Search of Good Deeds | Rosen/McSharry | 7.8 | 8.0 |
| 128 EN | On My Honor | Bauer, Marion Dane | 4.7 | 2.0 |
| 74241 EN | On Noah's Ark | Brett, Jan | 1.8 | 0.5 |
| 901619 EN | On Our Way (SF Edition) | Maxwell, Laura | 1.7 | 0.5 |
| 52155 EN | On Shabbat | Fishman, Cathy Goldberg | 4.1 | 0.5 |
| 67 EN | On the Banks of Plum Creek | Wilder, Laura Ingalls | 4.6 | 8.0 |
| 630 EN | On the Far Side of the Mountain | George, Jean Craighead | 4.5 | 6.0 |
| 902885 EN | On the Move (SF Edition) | Vilar, Miguel | 8.3 | 0.5 |
| 901050 EN | On the Pampas (SF Edition) | Brusca, Maria Cristina | 4.0 | 0.5 |
| 46312 EN | On the Trail of Sacagawea | Lourie, Peter | 6.7 | 1.0 |
| 5033 EN | On the Way Home | Wilder, Laura Ingalls | 5.3 | 3.0 |
| 48057 EN | On the Wing: American Birds in Migration | Lerner, Carol | 7.0 | 1.0 |
| 11184 EN | On Top of Spaghetti | Glazer, Tom | 2.1 | 0.5 |
| 7117 EN | Once and Future King, The | White, T.H. | 7.4 | 41.0 |
| 62564 EN | Once Upon a Marigold | Ferris, Jean | 5.7 | 8.0 |
| 9619 EN | One Day at HorrorLand | Stine, R.L. | 3.4 | 3.0 |
| 44824 EN | One Eye Laughing, the Other Weeping: The Diary of Julie Weiss | Denenberg, Barry | 5.6 | 6.0 |
| 241 EN | One-Eyed Cat | Fox, Paula | 5.4 | 7.0 |
| 776 EN | One Fat Summer | Lipsyte, Robert | 4.2 | 6.0 |
| 9042 EN | One Fish, Two Fish, Red Fish, Blue Fish | Seuss, Dr. | 1.7 | 0.5 |
| 52324 EN | One Giant Leap: The First Moon Landing | Rau, Dana Meachen | 3.8 | 0.5 |
| 901114 EN | One Good Swing (SF Edition) | Eyck, John E. Ten | 3.2 | 0.5 |
| 900927 EN | One Grain of Rice: A Mathematical Folktale (SF Edition) | Demi | 3.6 | 0.5 |
| 901588 EN | One Hundred Days Old (SF Edition) | O'Brien, Anne Sibley | 1.3 | 0.5 |
| 901161 EN | One Hundred Houses (SF Edition) | Otfinoski, Steven | 3.4 | 0.5 |
| 679 EN | One in the Middle Is the Green Kangaroo, The | Blume, Judy | 2.5 | 0.5 |
| 7585 EN | One Morning in Maine | McCloskey, Robert | 4.4 | 0.5 |
| 902847 EN | One of the Greatest Inventions (SF Edition) | Carona, Philip | 2.3 | 0.5 |
| 5239 EN | One of the Third Grade Thonkers | Naylor, Phyllis Reynolds | 5.1 | 4.0 |
| 6083 EN | One of Three | Johnson, Angela | 2.4 | 0.5 |
| 43522 EN | One Riddle, One Answer | Thompson, Lauren | 3.5 | 0.5 |
| 777 EN | One Thing for Sure | Gifaldi, David | 4.2 | 6.0 |
| 68 EN | Onion John | Krumgold, Joseph | 4.5 | 8.0 |
| 68986 EN | Or Give Me Death: A Novel of Patrick Henry's Family | Rinaldi, Ann | 4.0 | 6.0 |
| 14867 EN | Ordinary Genius: The Story of Albert Einstein | McPherson, Stephanie Sammartino | 6.4 | 2.0 |
| 380 EN | Ordinary Jack | Cresswell, Helen | 5.6 | 8.0 |
| 2018 EN | Oregon Facts and Symbols | McAuliffe, Emily | 3.9 | 0.5 |
| 7118 EN | Oregon Trail, The | Parkman, Francis | 8.5 | 22.0 |
| 6623 EN | Oren Bell | Burgess, Barbara | 5.2 | 7.0 |
| 6393 EN | Original Freddie Ackerman, The | Irwin, Hadley | 6.0 | 6.0 |
| 9645 EN | Orphan Boy, The | Mollel, Tololwa M. | 3.9 | 0.5 |
| 73488 EN | Orville: A Dog Story | Kimmel, Haven | 4.7 | 0.5 |
| 7337 EN | Oscar Otter | Benchley, Nathaniel | 2.6 | 0.5 |
| 6025 EN | Other Bells for Us to Ring | Cormier, Robert | 5.9 | 4.0 |
| 488 EN | Otherwise Known as Sheila the Great | Blume, Judy | 3.5 | 4.0 |
| 6482 EN | Otis Spofford | Cleary, Beverly | 4.6 | 4.0 |
| 900949 EN | Otto's Mess (SF Edition) | Kleinhenz, Sydnie Meltzer | 1.6 | 0.5 |
| 901413 EN | Our Family Get-Together (SF Edition) | Tafolla/Bernal | 2.0 | 0.5 |
| 35294 EN | Our Only May Amelia | Holm, Jennifer L. | 4.8 | 7.0 |
| 901479 EN | Our Place (SF Edition) | Phillips, Anne | 1.2 | 0.5 |
| 6007 EN | Our Sixth-Grade Sugar Babies | Bunting, Eve | 3.9 | 4.0 |
| 28871 EN | Our Solar System (Look into Space) | Kirkwood, Jon | 6.4 | 0.5 |
| 44826 EN | Our Strange New Land: Elizabeth's Diary...Virginia,1609 | Hermes, Patricia | 3.2 | 2.0 |
| 7586 EN | Our Teacher's Having a Baby | Bunting, Eve | 2.6 | 0.5 |
| 15232 EN | Our Teacher's in a Wheelchair | Powers, Mary Ellen | 3.7 | 0.5 |
| 66206 EN | Our Tree House | Mayer, Mercer | 1.4 | 0.5 |
| 901051 EN | Out of the Blue (SF Edition) | Fritz, Jean | 5.2 | 0.5 |
| 18783 EN | Out of the Dust | Hesse, Karen | 5.3 | 3.0 |
| 381 EN | Outsiders, The | Hinton, S.E. | 4.7 | 7.0 |
| 11185 EN | Over and Over | Zolotow, Charlotte | 3.9 | 0.5 |
| 129 EN | Over Sea, Under Stone | Cooper, Susan | 5.4 | 12.0 |
| 5531 EN | Owl and the Pussycat, The | Lear, Edward | 2.5 | 0.5 |
| 7387 EN | Owl at Home | Lobel, Arnold | 2.7 | 0.5 |
| 5532 EN | Owl Moon | Yolen, Jane | 3.2 | 0.5 |
| 680 EN | Owls in the Family | Mowat, Farley | 5.0 | 3.0 |
| 40796 EN | Owls (Wild Birds of Prey) | Kops, Deborah | 5.8 | 0.5 |