| Old "Reading and 'riting" tune | 44 |
| Old "Put a tiger in your tank" brand | 46 |
| Old "public diplomacy" org. | 37 |
| Old "House Party" host | 32 |
| Old "Hollywood Squares" regular | 41 |
| Old "Hollywood Squares" celeb | 39 |
| Old "Hits the spot" sloganeer | 39 |
| Old "Hits the Spot" marketer | 38 |
| Old "Happy motoring!" sloganeer | 41 |
| Old "Gotta have it" sloganeer | 39 |
| Old "Go from flat to fluffy" sloganeer | 48 |
| Old "Buffy the Vampire Slayer" network | 48 |
| Old "Buffy the Vampire Slayer" channel | 48 |
| Old "Best by taste test" sloganeer | 44 |
| Old 'Up, up and away' carrier | 37 |
| Old ''Tonight Show'' starter | 44 |
| Old ''Matter of Fact'' columnist | 48 |
| Olaf's girlfriend in Lemony Snicket books | 45 |
| Oktoberfest's beginning mo., oddly | 38 |
| Oksana ___, 1994 gold-medal skater | 34 |
| Oklahoma’s “Wheat Capital” | 38 |
| Oklahoma's ___ Tree National golf course | 44 |
| Oklahoma's second-largest city | 34 |
| Oklahoma's second largest city | 34 |
| Oklahoma's first state capital | 34 |
| Oklahoma's "Wheat Capital" | 40 |
| Oklahoma's "Golden Hurricane" | 43 |
| Oklahoma senator who doubts global warming | 42 |
| Oklahoma city with an active Tea Party | 38 |
| Oklahoma city on the Chisholm Trail | 35 |
| Oklahoma city on the Cherokee Strip | 35 |
| Oklahoma city north-northwest of Oklahoma City | 46 |
| Oklahoma city near Vance Air Force Base | 39 |
| Oklahoma city near Oral Roberts's birthplace | 48 |
| Oklahoma city near Oklahoma City | 32 |
| Oklahoma city named for a Tennyson character | 44 |
| Oklahoma city named after a Tennyson character | 46 |
| Oklahoma birthplace of Oral Roberts | 35 |
| Okla. campus with a Prayer Tower | 32 |
| Okefenokee Swamp inhabitant of fiction | 38 |
| Okefenokee Swamp inhabitant of comics | 37 |
| Okay to consume, as for Passover | 32 |
| OK Go "This Too ___ Pass" | 35 |
| OK Go "1000 Miles ___ Hour" | 37 |
| Oinker who designed a commercial space shuttle? | 47 |
| Oingo Boingo "Only a ___" | 35 |
| Oily buildup that's been around a long time? | 48 |
| Oils obtained from petroleum, coal or wood | 42 |
| Oilman Leon who owned the New York Jets | 39 |
| Oilman Leon who once owned the New York Jets | 44 |
| Oil-well firefighter "Red" | 36 |
| Oil-Free Maximum Strength Acne Wash maker | 41 |
| Oil-burning cup used as a beacon | 32 |
| Oil ___ Harry (Mighty Mouse nemesis) | 36 |
| Oil worker's after-death experience? | 40 |
| Oil rig worker, __, __, auto body repairman | 43 |
| Oil pitched by Florence Henderson | 33 |
| Oil in Earl Grey tea is announced? | 34 |
| Oil corporation based in Irving, Texas | 38 |
| Oil corp. based in La Palma, Calif. | 35 |
| Oil containers ["Get down!"] | 38 |
| Oil company, in Wall Street lingo | 33 |
| Oil company with annual toy trucks | 34 |
| Oil company with a toy truck line | 33 |
| Oil company with a sign visible from Fenway Park | 48 |
| Oil company with a "trimark" logo | 43 |
| Oil company sold to Texaco in 1984 | 34 |
| Oil company headquartered in New York City | 42 |
| Oil company founded by George H.W. Bush | 39 |
| Oil Can ___ ('80s Red Sox pitcher) | 38 |
| Oil / Insurance companies merge? | 32 |
| Ohio-born acquirer of well over 1,000 patents | 45 |
| Ohio's Wright-Patterson, e.g.: Abbr. | 40 |
| Ohio's "Rubber City" | 34 |
| Ohio's "City of Invention" | 40 |
| Ohio urban redevelopment result? | 32 |
| Ohio university, city, or county | 32 |
| Ohio university whose team is the Golden Flashes | 48 |
| Ohio State basketball coach Matta | 33 |
| Ohio State athlete who forgot his uniform? | 42 |
| Ohio Northern UniversityÂ’s city | 35 |
| Ohio home of the Wright brothers | 32 |
| Ohio home of Corporal Klinger on "MASH" | 49 |
| Ohio governor who became president | 34 |
| Ohio community named for a Connecticut town | 43 |
| Ohio college named for a biblical city | 38 |
| Ohio college attended by Karen O and Liz Phair | 46 |
| Ohio city, birthplace of President Hayes | 40 |
| Ohio city where William McKinley was born | 41 |
| Ohio city where Clark Gable lived | 33 |
| Ohio city where Alcoholics Anonymous was founded | 48 |
| Ohio city where A.A. was founded | 32 |
| Ohio city named for a mathematician | 35 |
| Ohio cheerleader's request, twice | 37 |
| Ohio birthplace of William McKinley | 35 |
| Ohio birthplace of Toni Morrison | 32 |
| Ohia "Hearts ___ Arrived" | 35 |
| Oh-so-cute carnival prizes, briefly | 35 |
| OH-H NICE! TELL ARISTIDE FOES... | 32 |
| Oh's role in "Grey's Anatomy" | 47 |