| 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 |
| One of music's three B's | 32 |
| One of multiple jobs, metaphorically | 36 |
| One of multiple chemical activators | 35 |
| One of Mrs. Browning's poems | 32 |
| One of Mozart's? | 20 |
| One of Mozart's 41 (abbr.) | 30 |
| One of Mowgli's mentors in "The Jungle Book" | 58 |
| One of Mother Dionne's five | 31 |
| One of Moses's spies | 24 |
| One of Moses' spies in Canaan | 33 |
| One of Moses' spies | 23 |
| One of Moses' seventy elders | 32 |
| One of Morrison's group? | 28 |
| One of more than four million Turks | 35 |
| One of more than a dozen popes | 30 |
| One of more than a billion believers | 36 |
| One of more than 76 million in the U.S. | 39 |
| One of more than 5,000 in the United States, per the Census Bureau | 66 |
| One of more than 245,000 in a Christmas tree at a California theme park | 71 |
| One of Montezuma's people | 29 |
| One of Montezuma's men | 26 |
| One of Monopoly's light blue avenues | 40 |
| One of Monaco's 368 | 23 |
| One of Mohammed's four perfect women | 40 |
| One of Mo.'s neighbors | 26 |
| One of Mnemosyne's daughters | 32 |
| One of Mitt's rivals in the 2012 primaries | 46 |
| One of Minn.'s twins | 24 |
| One of Minn.'s Twin Cities | 30 |
| One of Miguel Cabrera's 109 in 2012 | 39 |
| One of Mickey's wives | 25 |
| One of Mickey's exes | 24 |
| One of Mickey's arms on a Mickey Mouse watch | 48 |