| Elaine O'Brien |
Anita of Rancho del Mar (age 9-12) family , historical |
| Robert C. O'Brien |
Mrs. Frisby and the Rats of NIMH (age 9-12) adventure , brilliant protagonist |
| Tyne O'Connell |
Pulling Princes (age 12+) in: The Calypso Chronicles popularity , humor , school , romance , friendship |
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Dueling Princes (age 12+) in: The Calypso Chronicles popularity , humor , school , romance , friendship | |
| Barbara O'Connor |
How to Steal a Dog (age 8-11) growing up , family , enterprise |
| Kathleen O'Dell |
Agnes Parker, Girl in Progress (age 9-12) in: Agnes Parker Series growing up , friendship , school |
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Agnes Parker, Happy Camper? (age 9-12) in: Agnes Parker Series growing up , friendship , school | |
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Agnes Parker, Keeping Cool in Middle School (age 9-12) in: Agnes Parker Series growing up , friendship , school | |
| Scott O'Dell |
Sing Down the Moon (age 9-12) adventure , historical |
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Zia (age 9-12) adventure , historical | |
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Sarah Bishop (age 12+) war , survival , family , historical | |
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Island of the Blue Dolphins (age 9-12) survival , adventure , historical | |
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Thunder Rolling in the Mountains (age 9-12) adventure , historical | |
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The Black Pearl (age 12+) nature , spooky , adventure | |
| Liam O'Donnell |
Blackbeards Sword: The Pirate King of the Carolinas (age 8-11) comics , historical , adventure , action |
| Frank O'Rourke |
Burton and Stanley (age 7-10) animals |
| Barbara Oconnor |
The Small Adventure of Popeye and Elvis (age 8-11) realistic , self-reliance , adventure , humor |
| Darrel Odgers |
Dog Den Mystery (age 7-10) in: Jack Russell, Dog Detective Series mystery |
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The Phantom Mudder (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Mugged Pug (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Sausage Situation (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Awful Pawful (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Lying Postman (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Buried Bisuits (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
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The Kidnapped Creature (age 7-10) in: Jack Russell, Dog Detective Series mystery | |
| Charles Ogden |
Rare Beasts (age 9-12) in: Edgar and Ellen Series humor , mystery |
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Tourist Trap (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Under Town (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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High Wire (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Nod's Limbs (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Pet's Revenge (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Hot Air (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Frost Bites (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Split Ends (age 9-12) in: Edgar and Ellen Series humor , mystery | |
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Edgar and Ellen Mischief Manual: An Expert's Guide to Planning Perpetrating and Plausibly Denying All Pranks Great and Small But Mostly Great (age 9-12) in: Edgar and Ellen Series humor , mystery | |
| Kathleen Olmstead |
The Strange Case of Dr. Jekyll and Mr. Hyde (age 9-12) identity , spooky |
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Pollyanna (age 9-12) family , friendship | |
| Kenneth Oppel |
Silverwing (age 9-12) in: The Silverwing Trilogy growing up , action , adventure |
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Sunwing (age 9-12) in: The Silverwing Trilogy growing up , action , adventure | |
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Firewing (age 9-12) in: The Silverwing Trilogy growing up , action , adventure | |
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Darkwing (age 10+) fantasy , action , adventure | |
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Airborn (age 12+) action , adventure , fantasy | |
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Skybreaker (age 12+) sequel to: Airborn action , adventure , fantasy | |
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Starclimber (age 12+) sequel to: Airborn action , adventure , fantasy | |
| Doris Orgel |
Don't Call Me Slob-o (age 7-10) identity , friendship |
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The Devil in Vienna (age 10+) friendship , bigotry , war , survival , historical | |
| Uri Orlev |
The Man From the Other Side (age 9-12) war , survival , historical |
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The Island on Bird Street (age 9-12) war , survival , historical | |
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The Lady with the Hat (age 12+) bigotry , war , survival , historical , family | |
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Run, Boy, Run: A Novel (age 10+) adventure , bigotry , war , survival , historical , identity | |
| Wendy Orr |
Mokie and Bik (age 7-10) humor , family |
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Nim's Island (age 8-11) humor , friendship , adventure , nature , survival | |
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Nim at Sea (age 8-11) sequel to: Nim's Island humor , friendship , adventure , nature , survival | |
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Lost! a Dog Called Bear (age 8-11) in: Rainbow Street Shelter Series realistic , adventure , animals | |
| Mary Pope Osborne |
Afternoon on the Amazon (age 7-10) in: Magic Tree House Series adventure , historical |
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Blizzard of the Blue Moon (age 7-10) in: Magic Tree House Series adventure , historical | |
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Buffalo Before Breakfast (age 7-10) in: Magic Tree House Series adventure , historical | |
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Carnival at Candlelight (age 7-10) in: Magic Tree House Series adventure , historical | |
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Christmas in Camelot (age 7-10) in: Magic Tree House Series adventure , historical | |
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Civil War on Sunday (age 7-10) in: Magic Tree House Series adventure , historical | |
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A Crazy Day with Cobras (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dark Day in the Deep Sea (age 7-10) in: Magic Tree House Series adventure , historical | |
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Day of the Dragon King (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dingoes at Dinnertime (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dinosaurs Before Dark (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dogs in the Dead of Night (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dolphins at Daybreak (age 7-10) in: Magic Tree House Series adventure , historical | |
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Dragon of the Red Dawn (age 7-10) in: Magic Tree House Series adventure , historical | |
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Earthquake in the Early Morning (age 7-10) in: Magic Tree House Series adventure , historical | |
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Eve of the Emperor Penguin (age 7-10) in: Magic Tree House Series adventure , historical | |
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A Ghost Tale for Christmas Time (age 7-10) in: Magic Tree House Series adventure , historical | |
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Ghost Town at Sundown (age 7-10) in: Magic Tree House Series adventure , historical | |
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Good Morning, Gorillas (age 7-10) in: Magic Tree House Series adventure , historical | |
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A Good Night for Ghosts (age 7-10) in: Magic Tree House Series adventure , historical | |
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Haunted Castle on Hallows Eve (age 7-10) in: Magic Tree House Series adventure , historical | |
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High Tide in Hawaii (age 7-10) in: Magic Tree House Series adventure , historical | |
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Hour of the Olympics (age 7-10) in: Magic Tree House Series adventure , historical | |
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The Knight at Dawn (age 7-10) in: Magic Tree House Series adventure , historical | |
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Leprechaun in Late Winter (age 7-10) in: Magic Tree House Series adventure , historical | |
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Lions at Lunchtime (age 7-10) in: Magic Tree House Series adventure , historical | |
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Midnight on the Moon (age 7-10) in: Magic Tree House Series adventure , historical | |
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Monday With a Mad Genius (age 7-10) in: Magic Tree House Series adventure , historical | |
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Moonlight on the Magic Flute (age 7-10) in: Magic Tree House Series adventure , historical | |
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Mummies in the Morning (age 7-10) in: Magic Tree House Series adventure , historical | |
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Night of the New Magicians (age 7-10) in: Magic Tree House Series adventure , historical | |
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Night of the Ninjas (age 7-10) in: Magic Tree House Series adventure , historical | |
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Pirates Past Noon (age 7-10) in: Magic Tree House Series adventure , historical | |
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Polar Bears Past Bedtime (age 7-10) in: Magic Tree House Series adventure , historical | |
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Revolutionary War on Wednesday (age 7-10) in: Magic Tree House Series adventure , historical | |
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Season of the Sandstorms (age 7-10) in: Magic Tree House Series adventure , historical | |
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Stage Fright on a Summer Night (age 7-10) in: Magic Tree House Series adventure , historical | |
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Summer of the Sea Serpent (age 7-10) in: Magic Tree House Series adventure , historical | |
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Sunset of the Sabertooth (age 7-10) in: Magic Tree House Series adventure , historical | |
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Thanksgiving on Thursday (age 7-10) in: Magic Tree House Series adventure , historical | |
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Tigers at Twilight (age 7-10) in: Magic Tree House Series adventure , historical | |
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Tonight on the Titanic (age 7-10) in: Magic Tree House Series adventure , historical | |
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Twister on Tuesday (age 7-10) in: Magic Tree House Series adventure , historical | |
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Vacation Under the Volcano (age 7-10) in: Magic Tree House Series adventure , historical | |
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Viking Ships at Sunrise (age 7-10) in: Magic Tree House Series adventure , historical | |
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Winter of the Ice Wizard (age 7-10) in: Magic Tree House Series adventure , historical | |
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The One-Eyed Giant (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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The Land of the Dead (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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Sirens and Sea Monsters (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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The Gray-Eyed Goddess (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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Return to Ithaca (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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The Final Battle (age 8-11) in: Tales From the Odyssey adventure , voyages/journeys , folklore | |
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My Secret War: the World War II Diary of Madeline Beck, Long Island, New York, 1941 (age 8-11) in: Dear America Series war , identity , letters/journal , historical | |
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Standing in the Light: the Captive Diary of Catherine Carey Logan, Delaware Valley, Pennsylvania, 1763 (age 8-11) in: Dear America Series war , identity , letters/journal , historical | |
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My Brother's Keeper: Virginia's Civil War Diary (age 7-10) in: My America Series letters/journal , historical | |
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A Time to Dance (age 7-10) in: My America Series letters/journal , historical | |
| James Otis |
Toby Tyler, or Ten Weeks With a Circus (age 9-12) enterprise , adventure , the arts |