| One of Pittsburgh's three | 29 |
| One of Pittsburgh's rivers | 30 |
| One of Phoebe's friends | 27 |
| One of Peter's picks | 24 |
| One of Peter Rabbit's sisters | 33 |
| One of Peter Rabbit's siblings | 34 |
| One of Pete Rose's records | 30 |
| One of Perry's top reporters | 32 |
| One of Perry's reporters at the Daily Planet | 48 |
| One of Perry's reporters | 28 |
| One of Penelope's 108 in the "Odyssey" | 52 |
| One of Pétain's names | 28 |
| One of Pavarotti's assets | 29 |
| One of Pauline's adventures | 31 |
| One of Paul Revere's signals | 32 |
| One of Paul Revere's message options | 40 |
| One of Pandora's finds | 26 |
| One of Pan's foes | 21 |
| One of Pan's companions | 27 |
| One of Pac-Man's pursuers | 29 |
| One of P-R-N-D-L | 16 |
| One of Ozzie and Harriet's boys | 35 |
| One of Oxford's colleges | 28 |
| One of over a dozen popes | 25 |
| One of over 2,000,000 Cubans | 28 |
| One of over 100 on a table | 26 |
| One of over 1,250 restaurants, briefly | 38 |
| One of Orson's exes | 23 |
| One of Orion's pets | 23 |
| One of Ophelia's herbs | 26 |
| One of Ophelia's flowers | 28 |
| One of OPEC's founders | 26 |
| One of OPEC's charter members | 33 |
| One of only two women on Rolling Stone's list of "100 Greatest Guitarists of All Time" | 100 |
| One of only two S.A. countries that don't border Brazil | 59 |
| One of only two presidents with two Ivy League degrees | 54 |
| One of only three golfers who briefly kept Tiger Woods out of the World #1 spot between 1/11/1998 and 10/30/2010 | 112 |
| One of only 10 players to have the three-year waiting period waived for | 71 |
| One of one's dukes | 22 |
| One of one hundred | 18 |
| One of Omar's wishes | 24 |
| One of Omar's three wishes | 30 |
| One of Omar's creations | 27 |
| One of Olds's cars | 22 |
| One of Old's cars | 21 |
| One of old Hollywood's Big Five | 35 |
| One of Odin's wolves | 24 |
| One of October's birthstones | 32 |
| One of Oberon's subjects | 28 |
| One of O'Brien's forerunners | 36 |
| One of numerous childhood spots? | 32 |
| One of Nod's two partners | 29 |
| One of Noah's sons | 22 |
| One of Noah's descendants | 29 |
| One of Noah's boys | 22 |
| One of Nixon's vices? | 25 |
| One of Nixon's V.P.s | 24 |
| One of Nintendo's Mario Brothers | 36 |
| One of nine: Abbr. | 18 |
| One of nine, usually | 20 |
| One of nine sisters of Greek myth | 33 |
| One of nine sisters in myth | 27 |
| One of nine sisters | 19 |
| One of nine Siamese kings | 25 |
| One of nine revolvers | 21 |
| One of nine on Parnassus | 24 |
| One of nine on a Clue board | 27 |
| One of nine numbers on a card | 29 |
| One of nine Muses | 17 |
| One of nine major bodies | 24 |
| One of nine in golf | 19 |
| One of nine for eighteen holes | 30 |
| One of nine | 11 |
| One of Nike's Most Valuable Puppets in TV ads | 49 |
| One of Nigeria's principal languages | 40 |
| One of Nigeria's languages (var.) | 37 |
| One of Nigeria's languages | 30 |
| One of Niña's gaffs | 26 |
| One of Niña's companions | 31 |
| One of New Zealand's official languages | 43 |
| One of New York's Fingers | 29 |
| One of New York's Finger Lakes | 34 |
| One of New York's finest e.g. | 34 |
| One of New Guinea's two countries | 37 |
| One of Ness's guys | 22 |
| One of Nero Wolfe's employees | 33 |
| One of Neptune's moons | 26 |
| One of Nelson Riddle's fortes | 33 |
| One of Ned Flanders's sons | 30 |
| One of Ned Flanders's boys | 30 |
| One of Ned Flanders' sons | 29 |
| One of NBC's "Friends" | 36 |
| One of nature's kingdoms | 28 |
| One of NATO's founding members | 34 |
| One of Natalie's "Black Swan" co-stars | 52 |
| One of Napoleon's marshals | 30 |
| One of Nancy's predecessors | 31 |
| One of Nadya Suleman's kids, e.g. | 37 |
| One of N.J.'s Oranges | 25 |
| One of my favourite cities in North America | 43 |