| An "O" with a Tail | (4257) | 93/08/05 |
| O'Hare Airport | (4469) | 94/03/05 |
| O-Tera | (5340) | 96/07/23 |
| O. Henry | (5390) | 96/09/11 |
| Oasis of Peace | (4200) | 93/06/09 |
| Obese Americans | (6125) | 98/09/16 |
| Obesity | (4845) | 95/03/16 |
| Obesity | (5874) | 98/01/08 |
| Object of Worship | (5779) | 97/10/05 |
| Obligations | (4960) | 95/07/09 |
| Oceans and Seas | (5551) | 97/02/19 |
| Odd Numbers | (4359) | 93/11/15 |
| "Odd" | (4625) | 94/08/08 |
| Odors | (4348) | 93/11/04 |
| Offensive Words | (6287) | 99/02/25 |
| Offering Box/Thief | (6208) | 98/12/08 |
| Ohio | (5916) | 98/02/19 |
| OK | (5026) | 95/09/13 |
| Okinawa | (5263) | 96/05/07 |
| Old New Year's Day | (4418) | 94/01/13 |
| Old Testament Prophecy | (4190) | 93/05/30 |
| Old/New Testament | (4855) | 95/03/26 |
| Oldest Climber | (4132) | 93/04/02 |
| Olive Oil | (5209) | 96/03/14 |
| Oliver Cromwell | (5251) | 96/04/25 |
| Oliver Wendell Holmes | (4837) | 95/03/08 |
| Oliver Wendell Holmes | (6107) | 98/08/29 |
| An Olympic Torchbearer | (5839) | 97/12/04 |
| The Olympics | (5354) | 96/08/06 |
| Ominous/Predicament | (5465) | 96/11/25 |
| Omnibus | (4800) | 95/01/30 |
| "Omuraisu" | (6039) | 98/06/22 |
| On Popocatepetl | (4742) | 94/12/03 |
| On the Internet | (5223) | 96/03/28 |
| On the Ocean | (5211) | 96/03/16 |
| On the Roadside | (4686) | 94/10/08 |
| One Extra Hour | (5742) | 97/08/29 |
| One Sunday Walk | (4847) | 95/03/18 |
| One Yen More | (5980) | 98/04/24 |
| One | (4534) | 94/05/09 |
| Only God Qualified to Judge | (4421) | 94/01/16 |
| Only One God | (5947) | 98/03/22 |
| Opera | (5796) | 97/10/22 |
| Orange Day | (5329) | 96/07/12 |
| Oregon | (5180) | 96/02/14 |
| Organ Recital | (4993) | 95/08/11 |
| An Organ | (6002) | 98/05/16 |
| Oriental Medicine | (4213) | 93/06/22 |
| 'Origami' | (4346) | 93/11/02 |
| Orphanage Land | (5400) | 96/09/21 |
| Orthography | (4592) | 94/07/06 |
| Ostriches | (4565) | 94/06/09 |
| Otsuya | (5804) | 97/10/30 |
| Ounce/Inch | (5689) | 97/07/07 |
| Our Honeymoon | (4987) | 95/08/05 |
| Our Kitchen | (5981) | 98/04/25 |
| Our Wedding | (4980) | 95/07/29 |
| An Outdoor Telephone | (4455) | 94/02/19 |
| Overnight Train | (5876) | 98/01/10 |
| Overweight People | (5447) | 96/11/07 |