| Oil Can ___ ('80s Red Sox pitcher) | 38 |
| Oil company founded by George H.W. Bush | 39 |
| Oil company headquartered in New York City | 42 |
| Oil company sold to Texaco in 1984 | 34 |
| Oil company with a "trimark" logo | 43 |
| Oil company with a sign visible from Fenway Park | 48 |
| Oil company with a toy truck line | 33 |
| Oil company with annual toy trucks | 34 |
| Oil company, in Wall Street lingo | 33 |
| Oil containers ["Get down!"] | 38 |
| Oil corp. based in La Palma, Calif. | 35 |
| Oil corporation based in Irving, Texas | 38 |
| Oil in Earl Grey tea is announced? | 34 |
| Oil pitched by Florence Henderson | 33 |
| Oil rig worker, __, __, auto body repairman | 43 |
| Oil worker's after-death experience? | 40 |
| Oil ___ Harry (Mighty Mouse nemesis) | 36 |
| Oil-burning cup used as a beacon | 32 |
| Oil-Free Maximum Strength Acne Wash maker | 41 |
| Oil-well firefighter "Red" | 36 |
| Oilman Leon who once owned the New York Jets | 44 |
| Oilman Leon who owned the New York Jets | 39 |
| Oils obtained from petroleum, coal or wood | 42 |
| Oily buildup that's been around a long time? | 48 |
| Oingo Boingo "Only a ___" | 35 |
| Oinker who designed a commercial space shuttle? | 47 |
| OK Go "1000 Miles ___ Hour" | 37 |
| OK Go "This Too ___ Pass" | 35 |
| Okay to consume, as for Passover | 32 |
| Okefenokee Swamp inhabitant of comics | 37 |
| Okefenokee Swamp inhabitant of fiction | 38 |
| Okla. campus with a Prayer Tower | 32 |
| Oklahoma birthplace of Oral Roberts | 35 |
| Oklahoma city named after a Tennyson character | 46 |
| Oklahoma city named for a Tennyson character | 44 |
| Oklahoma city near Oklahoma City | 32 |
| Oklahoma city near Oral Roberts's birthplace | 48 |
| Oklahoma city near Vance Air Force Base | 39 |
| Oklahoma city north-northwest of Oklahoma City | 46 |
| Oklahoma city on the Cherokee Strip | 35 |
| Oklahoma city on the Chisholm Trail | 35 |
| Oklahoma city with an active Tea Party | 38 |
| Oklahoma senator who doubts global warming | 42 |
| Oklahoma's "Golden Hurricane" | 43 |
| Oklahoma's "Wheat Capital" | 40 |
| Oklahoma's first state capital | 34 |
| Oklahoma's second largest city | 34 |
| Oklahoma's second-largest city | 34 |
| Oklahoma's ___ Tree National golf course | 44 |
| Oklahoma’s “Wheat Capital” | 38 |
| Oksana ___, 1994 gold-medal skater | 34 |
| Oktoberfest's beginning mo., oddly | 38 |
| Olaf's girlfriend in Lemony Snicket books | 45 |
| Old ''Matter of Fact'' columnist | 48 |
| Old ''Tonight Show'' starter | 44 |
| Old 'Up, up and away' carrier | 37 |
| Old "Best by taste test" sloganeer | 44 |
| Old "Buffy the Vampire Slayer" channel | 48 |
| Old "Buffy the Vampire Slayer" network | 48 |
| Old "Go from flat to fluffy" sloganeer | 48 |
| Old "Gotta have it" sloganeer | 39 |
| Old "Happy motoring!" sloganeer | 41 |
| Old "Hits the Spot" marketer | 38 |
| Old "Hits the spot" sloganeer | 39 |
| Old "Hollywood Squares" celeb | 39 |
| Old "Hollywood Squares" regular | 41 |
| Old "House Party" host | 32 |
| Old "public diplomacy" org. | 37 |
| Old "Put a tiger in your tank" brand | 46 |
| Old "Reading and 'riting" tune | 44 |
| Old "S.N.L." character | 32 |
| Old "Supper Club" radio host | 38 |
| Old "Television Theatre" sponsor | 42 |
| Old "There's no step 3!" sloganeer | 48 |
| Old "Tonight Show" intro | 34 |
| Old "Tonight Show" starter | 36 |
| Old "Tonight Show" theme writer | 41 |
| Old "Up, up and away" airline | 39 |
| Old "Up, up and away" carrier | 39 |
| Old "Up, up and away" sloganeer | 41 |
| Old "What's My Line" panelist | 43 |
| Old "What's My Line?" name | 40 |
| Old "What's My Line?" panelist | 44 |
| Old "Your cup of inspiration" sloganeer | 49 |
| Old 7UP nickname, with 'the' | 36 |
| Old ABC series about a paramedic? | 33 |
| Old activist org. revived in 2006 | 33 |
| Old actress Renée of "La Bohème" | 48 |
| Old ad challenge to wannabe artists | 35 |
| Old afternoon TV staple, with "The" | 45 |
| Old Al Capp strip "___ an' Slats" | 47 |
| Old AMC car that came fully loaded? | 35 |
| Old analog device for capturing audio on tape | 45 |
| Old apartment's emergency exit | 34 |
| Old Apple product marketed to schools | 37 |
| Old Army base on the Santa Fe Trail, briefly | 44 |
| Old Athenian ally against Persia | 32 |
| Old attachment for "while" | 36 |
| Old autodom's Model M or Model T-6 | 38 |
| Old aviation comic strip "__ Jack" | 44 |