| Ontario's official bird | 27 |
| One of 10 leapers in a song | 27 |
| One of Judy's daughters | 27 |
| One of DonaldÂ’s nephews | 27 |
| Org. for women on the links | 27 |
| Omaha Beach lander, briefly | 27 |
| One photocopier tray: Abbr. | 27 |
| One getting an inspiration? | 27 |
| One of the Redgrave sisters | 27 |
| Old ewe in "Babe" | 27 |
| Old phone company sobriquet | 27 |
| Olympic skiers' surname | 27 |
| One of "the help" | 27 |
| Object of a knightly rescue | 27 |
| Opposite of "bon" | 27 |
| Orange Julius locale, often | 27 |
| One of the Berenstain Bears | 27 |
| One of TV's Brady girls | 27 |
| Ohio city north of Columbus | 27 |
| One of three Dutch painters | 27 |
| One-room schoolhouse figure | 27 |
| Old-fashioned schoolteacher | 27 |
| Oscar-winning Borgnine film | 27 |
| Oscar-winning Borgnine part | 27 |
| On-the-playing-field animal | 27 |
| One leading a bull session? | 27 |
| Olympic athlete's quest | 27 |
| One-named 1970's singer | 27 |
| One of a pair of door signs | 27 |
| On the ___ (getting better) | 27 |
| Only this, and nothing else | 27 |
| Owner of the Snoopy J blimp | 27 |
| One way to get around Paris | 27 |
| Oval Pepperidge Farm cookie | 27 |
| One of the Indianapolis 500 | 27 |
| Oases that aren't there | 27 |
| Org. for the Boys of Summer | 27 |
| Old computer dial-up device | 27 |
| One with a replaceable head | 27 |
| Old radio format, for short | 27 |
| Oliver Twist's entreaty | 27 |
| Onetime Italian leader Aldo | 27 |
| Org. that gives out ratings | 27 |
| Org. that approves trailers | 27 |
| One 60-thousandth of a min. | 27 |
| Oklahoma county or its seat | 27 |
| Orpheus-Eurydice tale, e.g. | 27 |
| One who makes appointments? | 27 |
| One place to apply sunblock | 27 |
| One whose work's a bust | 27 |
| Org. that sets launch dates | 27 |
| Org. that discovered GFAJ-1 | 27 |
| Org. for Apollo and Mercury | 27 |
| Orbiting telescope launcher | 27 |
| Org. based in Daytona Beach | 27 |
| Ogden who wrote light verse | 27 |
| Org. that Pelé played in | 27 |
| Odomes of the Buffalo Bills | 27 |
| Of ships and sailing: abbr. | 27 |
| Org. with Wizards and Magic | 27 |
| Org. with thirty franchises | 27 |
| Org. with Bulls and Raptors | 27 |
| Org. with a Sixth Man Award | 27 |
| Org. with a lot of centers? | 27 |
| Org. with eligibility rules | 27 |
| Org. supporting opera, etc. | 27 |
| Occurrences between springs | 27 |
| Obviously carefully written | 27 |
| One who leaves nothing out? | 27 |
| Opposite of "Ja!" | 27 |
| One of the six inert gasses | 27 |
| Old console using Game Paks | 27 |
| Ornithologist's concern | 27 |
| Owner of Purina and Perrier | 27 |
| Opposite of old, in Germany | 27 |
| Opposite of "alt" | 27 |
| Org. with Giants and Titans | 27 |
| Org. with Titans and Giants | 27 |
| Org. with Sharks and Flames | 27 |
| Org. with Devils and Flames | 27 |
| Org. with a 2004-05 lockout | 27 |
| Org. for Penguins and Ducks | 27 |
| One of Columbus's ships | 27 |
| One of Columbus's three | 27 |
| One of Columbus's fleet | 27 |
| One of Columbus' crafts | 27 |
| Old Chicago Outfit frontman | 27 |
| Opposite of "oui" | 27 |
| Opposite of "all" | 27 |
| Opposite of whole, milkwise | 27 |
| Opposite of everybody's | 27 |
| Opposite of "yup" | 27 |
| Opposite of "yep" | 27 |
| Opposite of "and" | 27 |
| Often-partnered conjunction | 27 |
| One of les points cardinaux | 27 |
| Oslo's land, to natives | 27 |
| Operation Just Cause target | 27 |
| Opera premiere: Milan, 1831 | 27 |
| Opposite of "sur" | 27 |