| ''Once ___ a time ...'' | 39 |
| ''Once ___ a Mattress'' | 39 |
| ''Once upon ___'' | 33 |
| ''Once upon a midnight ___ ...'' | 48 |
| ''Once Upon a Mattress'' legume | 47 |
| ''Once more,'' to Li'l Abner | 48 |
| ''Once in Love With __'' | 40 |
| ''Once a Hero'' actor Milo ___ | 46 |
| ''On the __ hand . . .'' | 40 |
| ''On the Waterfront'' director | 46 |
| ''On the Road'' narrator | 40 |
| ''On the other hand . . .'' | 43 |
| ''On the double!'' | 34 |
| ''On the Beach'' penner Shute | 45 |
| ''On the Beach'' novelist Shute | 47 |
| ''On the Beach'' novelist | 41 |
| ''On the Beach'' author | 39 |
| ''On Golden ___'' | 33 |
| ''On Golden __'' | 32 |
| ''On Golden Pond'' star | 39 |
| ''On Golden Pond'' bird | 39 |
| ''On a scale of one ___'' | 41 |
| ''Olympia'' painter Edouard | 43 |
| ''Oliver's Story'' author | 45 |
| ''Old'' British buddy | 37 |
| ''Old MacDonald'' refrain part | 46 |
| ''Old MacDonald'' refrain | 41 |
| ''Old Gray'' one | 32 |
| ''Old Folks at Home'' river | 43 |
| ''Old college'' thing | 37 |
| ''Olé,'' for example | 39 |
| ''Ol' Man River'' composer | 46 |
| ''Oklahoma!'' song subject | 42 |
| ''Oklahoma!'' role | 34 |
| ''Oklahoma!'' character | 39 |
| ''Oklahoma!'' aunt | 34 |
| ''Oklahoma!'' Annie | 35 |
| ''Okie From Muskogee'' Haggard | 46 |
| ''Okay with me!'' | 33 |
| ''Okay if ___ myself out?'' | 43 |
| ''Okay dice, . . .'' | 36 |
| ''Oh, you wish!'' | 33 |
| ''Oh, what's the ___?'' | 43 |
| ''Oh, that's why!'' | 39 |
| ''Oh, shut up!'' | 32 |
| ''Oh, Pretty Woman'' singer | 43 |
| ''Oh, go fly ___!'' | 35 |
| ''Oh, give me ___, where . . .'' | 48 |
| ''Oh, give me __ . . .'' | 40 |
| ''Oh, for Pete's ___!'' | 43 |
| ''Oh! Calcutta!'' cowriter | 42 |
| ''Oh yeah? ___ who?'' | 37 |
| ''Oh yeah, ___ who?'' | 37 |
| ''Oh me, oh my'' | 32 |
| ''Oh gracious!'' | 32 |
| ''Off the Court'' autobiographer | 48 |
| ''Of ___ I Sing'' | 33 |
| ''Of ___ are you speaking?'' | 44 |
| ''Of Thee I ___'' | 33 |
| ''Of Mice and ___'' | 35 |
| ''Of Mice and Men'' wife | 40 |
| ''Of Mice and Men'' character | 45 |
| ''Of course, dear lady'' | 40 |
| ''Of course not!'' | 34 |
| ''Odyssey'', e.g. | 33 |
| ''Odyssey'' singers | 35 |
| ''Odyssey'' sea goddess | 39 |
| ''Odyssey'' menace | 34 |
| ''Odyssey'' is one | 34 |
| ''Odyssey'' enchantress | 39 |
| ''Odyssey'' creator | 35 |
| ''Ode on a Grecian ___'' | 40 |
| ''Odds __ . . .'' | 33 |
| ''Odd Couple'' character | 40 |
| ''October Sky'' actress | 39 |
| ''O.K. with me'' | 32 |
| ''O ___ Golden Slippers'' | 41 |
| ''O ___ All Ye Faithful'' | 41 |
| ''O tempora o mores!'' orator | 45 |
| ''O Pioneers!'' setting | 39 |
| ''O Pioneers!'' author | 38 |
| ''O patria mia'' singer | 39 |
| ''O mio babbino caro,'' for one | 47 |
| ''O come, let us ___ Him'' | 42 |
| ''O come let us ___ Him'' | 41 |
| ''NYPD Blue'' setting | 37 |
| ''NYPD Blue'' creator | 37 |
| ''NYPD Blue'' alert | 35 |
| ''Nyet!'' sayers | 32 |
| ''Nutcracker'' dancer | 37 |
| ''Number one with a Coke,'' e.g. | 48 |
| ''Numb3rs'' network | 35 |
| ''Nuclear'' prefix | 34 |
| ''Now, ___ business . . .'' | 43 |
| ''Now, where __ I?'' | 36 |
| ''Now, look . . .'' | 35 |
| ''Now, about ...'' | 34 |
| ''Now, about . . .'' | 36 |
| ''Now!'' in the OR | 34 |
| ''Now ___ theater near you!'' | 45 |