O
| O'Dell, Scott | Sarah Bishop | 4.9 | 7 |
| O'Dell, Scott | Black Pearl, The | 5.4 | 4 |
| O'Dell, Scott | Island of the Blue Dolphins | 5.4 | 6 |
| O'Dell, Scott | Zia | 5.1 | 5 |
| Oltion, Jerry | Where Sea Meets Sky: Christopher Pike | 6.5 | 12 |
| O'Neal, Zibby | Language of Goldfish, The | 3.9 | 6 |
| Oppel, Kenneth | Dead Water Zone | 4.4 | 5 |
| Oppel, Kenneth | Silverwing | 4.7 | 9 |
| Orlev, Uri | Man from the Other Side, The | 5.6 | 8 |
| Orwell, George | 1984 | 8.9 | 17 |
| Orwell, George | Animal Farm | 7.3 | 5 |
| Osborn, Elinor | Project UltraSwan | 6.2 | 1 |
| Osborne, Mary Pope | Adaline Falling Star | 4.6 | 4 |
| Osborne, Mary Pope | My Secret War: The World War II Diary | 5.5 | 4 |
| Osborne, Mary Pope | Standing in the Light: The Captive Diary | 5.1 | 4 |
| Osborne, Shane | Born to Fly... U.S. Navy Pilot Lt | 7.9 | 7 |
| Otfinoski/Brunelle | Mammals (Plants and Animal Kingdoms) | 6.1 | 1 |