| "O is ___ then? My duty all ended" | 44 |
| "O Isis und Osiris," e.g. | 35 |
| "O Kaplan! My Kaplan!" author | 39 |
| "O magic ___!": Keats | 31 |
| "O magic _____!": Keats | 33 |
| "O May, Thy ___" (Robert Burns song) | 46 |
| "O mighty Caesar! ___ thou lie so low?": Shak. | 56 |
| "O mio babbino caro," e.g. | 36 |
| "O mio babbino caro," for one | 39 |
| "O mio babbino ___" (Puccini aria) | 44 |
| "O my prophetic ___!": Hamlet | 39 |
| "O naked Moon full-___!": Browning | 44 |
| "O nightingale, that on __ bloomy spray ...": Milton | 62 |
| "O patria mia" is one | 31 |
| "O patria mia" singer | 31 |
| "O patria mia" source | 31 |
| "O patria mia," e.g. | 30 |
| "O patria __": "Aida" aria | 46 |
| "O patria ___" ("Aida" aria) | 48 |
| "O patria ___," Verdi aria | 36 |
| "O Pioneers!" author | 30 |
| "O Pioneers!" novelist Cather | 39 |
| "O Pioneers!" setting | 31 |
| "O Rare Ben Johnson" is engraved (in error) on one | 60 |
| "O rare" poet | 23 |
| "O Rei do Futebol" | 28 |
| "O Sacred Head, Now Wounded," e.g. | 44 |
| "O Sanctissima," e.g. | 31 |
| "O say can you see" or "Thru the perilous fight"? | 69 |
| "O shed no ___!": Keats | 33 |
| "O shed ___!": Keats | 30 |
| "O short-liv'd pride! ___?": Shak. | 48 |
| "O Sole ---" | 22 |
| "O Sole Mio" composer di Capua | 40 |
| "O Sole __" | 21 |
| "O Sole ___" | 22 |
| "O Sole ___" (standard Italian song) | 46 |
| "O Sole ___" (tenor warhorse) | 39 |
| "O sole _____" | 24 |
| "O Tannenbaum" subject | 32 |
| "O Tannenbaum" time | 29 |
| "O tempora! O mores!" orator | 38 |
| "O tempora! O ___!" | 29 |
| "O tempora! O ___!": Cicero | 37 |
| "O tempora! O _____!" | 31 |
| "O tempora! ___!" | 27 |
| "O tempora! ___!": Cicero | 35 |
| "O tempora! _____!": Cicero | 37 |
| "O tempora, O mores!" speaker | 39 |
| "O tender yearning, sweet ___!": Schiller | 51 |
| "O terra, addio," e.g. | 32 |
| "O the cannons ___ their rosy-flashing muzzles!": Whitman | 67 |
| "O thou pale ___ that silent shines": Burns | 53 |
| "O Tibbie, I ___ seen the day": Burns | 47 |
| "O tiger's heart wrapp'd in a woman's ___!": Shak. | 72 |
| "O time most ___": Shak. | 34 |
| "O true apothecary! Thy drugs are quick" speaker | 58 |
| "O tu che in seno ___ angeli": Verdi aria | 51 |
| "O tu che in ___ . . . ": Verdi aria | 46 |
| "O vile, Intolerable, ___!": Shak. | 44 |
| "O wad some Pow'r the ___ gie us": Burns | 54 |
| "O wad some power the giftie ___ us / To see oursels as ithers see us!": Burns | 88 |
| "O __ babbino caro": Puccini aria | 43 |
| "O __ Mio": Annette Funicello hit | 43 |
| "O ___ addio," Verdi aria | 35 |
| "O ___ babbino caro" (Puccini aria) | 45 |
| "O ___ Ben Jonson!" | 29 |
| "O ___ I e'er took delight in thy praises": Byron | 63 |
| "O ___ is she!" (Jonson) | 34 |
| "O ___ let us adore Him" | 34 |
| "O ___ mia," Verdi aria | 33 |
| "O ___ Mio" | 21 |
| "O ___ Night" | 23 |
| "O ___ shall go mad": Lear | 36 |
| "O ___ we trust . . . " : Tennyson | 44 |
| "O ___! O mores!" | 27 |
| "O ___! que de bijoux!" ("Faust" aria) | 58 |
| "O ___" (Neapolitan song) | 35 |
| "O ___, amid the blaze of noon": Milton | 49 |
| "O ___, our help in ages past" | 40 |
| "O ___, pretty maiden . . . " | 39 |
| "O _____ Night" | 25 |
| "O! I am Fortune's ___" | 37 |
| "O! let me not be mad" speaker | 40 |
| "O! let me not be mad" speaker (NBA, NHL) | 51 |
| "O! swear ___ by the moon": Juliet | 44 |
| "O! that way madness ___": King Lear | 46 |
| "O! what ___ and peasant slave am I" | 46 |
| "O! wither'd is the garland of ___": Shak. | 56 |
| "O! ___ Fortune's fool": Shak. | 44 |
| "O'er bank and ___...he glanced away...": Sir Walter Scott | 72 |
| "O'er the --- we go ..." | 38 |
| "O'er the land of the ___ ..." | 44 |
| "O'er ___ we . . . " | 34 |
| "O'Hara's Choice" novelist | 44 |
| "O'Hara's Choice" novelist, 2003 | 50 |
| "O" follower | 22 |
| "O" in a phonetic alphabet | 36 |
| "O" in old radio lingo | 32 |
| "O" in the old Army phonetic alphabet | 47 |