| O | 1 |
| O h ____ : Chi-Lites hit | 28 |
| O = ? | 5 |
| O and GQ | 8 |
| O and W, e.g. | 13 |
| O and W, for short | 18 |
| O followers | 11 |
| O for 4 at bat, e.g. | 20 |
| O formation | 11 |
| O founder | 9 |
| O lead-in | 9 |
| O lead-ins | 10 |
| O leaguemate | 12 |
| O may stand for it | 18 |
| O O O . . . | 11 |
| O on the Beaufort scale | 23 |
| O or A, e.g. | 12 |
| O or A, in baseball | 19 |
| O or Cosmo | 10 |
| O or GQ | 7 |
| O or Jay | 8 |
| O or O | 6 |
| O positive, for one | 19 |
| O Sole ____ | 14 |
| O sole ____ | 11 |
| O staff, briefly | 16 |
| O ___ do Futebol (Pelé's nickname) | 41 |
| O! Baked treat! Warm and nourishing to eat!? | 44 |
| O'-shanter opener | 21 |
| O'Brian role: 1955–61 | 32 |
| O'Brien and Boone | 21 |
| O'Brien and Rooney | 22 |
| O'Brien is on after him | 27 |
| O'Brien is replacing him | 28 |
| O'Brien is scheduled to succeed him | 39 |
| O'Brien is slated to succeed him in 2009 | 44 |
| O'Brien of "D.O.A." | 33 |
| O'Brien of "The Barefoot Contessa" | 48 |
| O'Brien of "The Killers" | 38 |
| O'Brien of CNN | 18 |
| O'Brien of late-night TV | 28 |
| O'Brien or a barbarian | 26 |
| O'Brien or Boone | 20 |
| O'Brien or Ferber | 21 |
| O'Brien ouster | 18 |
| O'Brien predecessor | 23 |
| O'Brien predecessor and successor | 37 |
| O'Brien's late-night predecessor and successor | 54 |
| O'Brien's lead-in | 25 |
| O'Brien's predecessor | 29 |
| O'Brien's predecessor ... and successor | 47 |
| O'Brien's successor | 27 |
| O'Brien's Team ___ | 26 |
| O'Casey | 11 |
| O'Casey and Connery | 23 |
| O'Casey and O'Faoláin | 32 |
| O'Casey and O'Kelly | 27 |
| O'Casey and others | 22 |
| O'Casey character | 21 |
| O'Casey contemporary | 24 |
| O'Casey et al. | 18 |
| O'Casey or Connery | 22 |
| O'Casey or O'Faolain | 28 |
| O'Casey or O'Kelly | 26 |
| O'Casey or O'Neill | 26 |
| O'Casey or Penn | 19 |
| O'Casey outline | 19 |
| O'Casey play "_____ and the Paycock" | 50 |
| O'Casey studied it | 22 |
| O'Casey's "___ and the Paycock" | 49 |
| O'Casey's homeland | 26 |
| O'Casey's land | 22 |
| O'Casey's love | 22 |
| O'Casey's staff of life | 31 |
| O'clock or so | 17 |
| O'Connor and namesakes | 26 |
| O'Connor and Pleasence | 26 |
| O'Connor from Chicago | 25 |
| O'Connor of "The Invisible Man" | 45 |
| O'Connor of "Witness for the Prosecution" | 55 |
| O'Connor of "Xena" | 32 |
| O'Connor of "Xena: Warrior Princess" | 50 |
| O'Connor successor | 22 |
| O'Connor who played Gabrielle on "Xena" | 53 |
| O'Connor who played Gabrielle on "Xena: Warrior Princess" | 71 |
| O'Connor's "The Last ___" | 43 |
| O'Connor's "The ___ of Sadness" | 49 |
| O'Connor's cook on TV | 29 |
| O'Connor's predecessor on the Supreme Court | 51 |
| O'Connor's replacement | 30 |
| O'Connor's replacement on the Supreme Court | 51 |
| O'Connor's successor | 28 |
| O'Connor's successor as archbishop of New York | 54 |
| O'Connor's successor on the Supreme Court | 49 |
| O'Connor's Supreme Court replacement | 44 |
| O'Connor's Supreme Court successor | 42 |
| O'Connor's TV cook | 26 |
| O'Day of song | 17 |
| O'Day of songdom | 20 |
| O'Day or Baker | 18 |