| Otto I's realm, briefly | 27 |
| Otto I's realm: Abbr. | 25 |
| Otto von Bismarck's realm | 29 |
| Otto's "Oh no!" | 29 |
| Otto's "oh!" | 26 |
| Otto's predecessor | 22 |
| Otto's realm: Abbr. | 23 |
| Ottoman conquest of 1458 | 24 |
| Ottoman dynasty founder | 23 |
| Ottoman Empire bigwigs | 22 |
| Ottoman Empire dignitaries | 26 |
| Ottoman Empire founder | 22 |
| Ottoman Empire governor | 23 |
| Ottoman Empire governors | 24 |
| Ottoman Empire inhabitants | 26 |
| Ottoman Empire officer | 22 |
| Ottoman Empire officers | 23 |
| Ottoman Empire official | 23 |
| Ottoman Empire officials | 24 |
| Ottoman governors of yore | 25 |
| Ottoman honorific (Var.) | 24 |
| Ottoman imperial standard | 25 |
| Ottoman official (Var.) | 23 |
| Ottoman official of yore | 24 |
| Ottoman officials (Var.) | 24 |
| Ottoman potentates (Var.) | 25 |
| Ottoman rulers of yore | 22 |
| Ottoman's descendant | 24 |
| Ouagadougou's continent | 27 |
| Ought to have, in slang | 23 |
| Ought to have, informally | 25 |
| Ouija board alternative | 23 |
| Ouija board, allegedly | 22 |
| Ounce of protection worth | 25 |
| Our "mother" | 22 |
| Our appropriate year-end wish | 29 |
| Our counterpart in France? | 26 |
| Our first chief justice | 23 |
| Our Gang's Fat Joe | 22 |
| Our Gang's ring-eyed dog | 28 |
| Our heaviest president | 22 |
| Our Lady Peace '94 album | 28 |
| Our longest serving PM | 22 |
| Our Miss Brooks role | 23 |
| Our Miss Brooks star | 23 |
| Our most easterly provs. | 24 |
| Our most popular pastime | 24 |
| Our planet, to a Berliner | 25 |
| Our planet, to a German | 23 |
| Our planet, to the French | 25 |
| Our planetary neighbor | 22 |
| Our portliest president | 23 |
| Our sun, to astronomers | 23 |
| Our thanksgiving begins | 23 |
| Our thanksgiving continues | 26 |
| Our ultimate team sport | 23 |
| Our Valentine song singer | 25 |
| Our Valentine verse begins | 26 |
| Our Valentine verse continues | 29 |
| Our, to Père Noël | 23 |
| Ours, in parts of Quebec | 24 |
| Oust for nonpayment of rent | 27 |
| Oust from a high office | 23 |
| Ousted from a camp cot? | 23 |
| Out and out blitzkrieg | 22 |
| Out around midday, say | 22 |
| Out at the dentist's? | 25 |
| Out at the prom, maybe | 22 |
| Out beyond the breakers | 23 |
| Out for a sandwich, perhaps | 27 |
| Out for lunch, perhaps | 22 |
| Out for someone on the inside | 29 |
| Out for the evening, maybe | 26 |
| Out for the evening, perhaps | 28 |
| Out from under creditors | 24 |
| Out grocery shopping, maybe | 27 |
| Out in left field, say | 22 |
| Out in ___ (neglected) | 22 |
| Out Odd Future member Frank | 27 |
| Out of action, perhaps | 22 |
| Out of Africa, for an African | 29 |
| Out of bed and ready to go | 26 |
| Out of bed for the day | 22 |
| Out of bounds, in a way | 23 |
| Out of bounds, in baseball | 26 |
| Out of business (abbr.) | 23 |
| Out of business: Abbr. | 22 |
| Out of cards in a suit | 22 |
| Out of danger, originally? | 26 |
| Out of date, in a dict. | 23 |
| Out of fashion, in France | 25 |
| Out of fashion, in Paris | 24 |
| Out of favor, informally | 24 |
| Out of harm's way, maybe | 28 |
| Out of harmony, briefly | 23 |
| Out of juice, as a battery | 26 |
| Out of key, as a baby grand | 27 |
| Out of one's class? | 23 |
| Out of one's element | 24 |
| Out of one's gourd | 22 |