| One-person concerts | 19 |
| One-person cab | 14 |
| One-person boats | 16 |
| One-person boat made with animal hides | 38 |
| One-person boat | 15 |
| One-percenter | 13 |
| One-over-par score | 18 |
| One-one, for one | 16 |
| One-one and two-two | 19 |
| One-on-ones | 11 |
| One-on-one with a big shot | 26 |
| One-on-one type | 15 |
| One-on-one test | 15 |
| One-on-one teachers | 19 |
| One-on-one teacher | 18 |
| One-on-one talk | 15 |
| One-on-one student | 18 |
| One-on-one strategy | 19 |
| One-on-one sport | 16 |
| One-on-one scholar | 18 |
| One-on-one pupil | 16 |
| One-on-one Olympic sport | 24 |
| One-on-one offense, in basketball slang | 39 |
| One-on-one meeting, informally | 30 |
| One-on-one meeting | 18 |
| One-on-one learner | 18 |
| One-on-one job for a ladies' man? | 37 |
| One-on-one instructor | 21 |
| One-on-one gamble, usually | 26 |
| One-on-one fighters | 19 |
| One-on-one fight | 16 |
| One-on-one fencing sport | 24 |
| One-on-one exams | 16 |
| One-on-one exam | 15 |
| One-on-one encounter | 20 |
| One-on-one contests | 19 |
| One-on-one contest | 18 |
| One-on-one combats | 18 |
| One-on-one combat | 17 |
| One-on-one chats | 16 |
| One-on-one beneficiary | 22 |
| One-on-one battles | 18 |
| One-on-one battle | 17 |
| One-on-one affairs | 18 |
| One-on-one affair | 17 |
| One-on-one | 10 |
| One-of-a-kinders | 16 |
| One-of-a-kind find, to Caesar | 29 |
| One-of-a-kind Dutch cheese? | 27 |
| One-of-a-kind book? | 19 |
| One-of-a-kind | 13 |
| One-nighters for Jo Anne | 24 |
| One-night ___ | 13 |
| One-night stand souvenirs, sometimes: Abbr. | 43 |
| One-night stand souvenir: Abbr. | 31 |
| One-night stand necessity | 25 |
| One-night stand | 15 |
| One-named, Grammy-winning rapper | 32 |
| One-named writer of "Under Two Flags" | 47 |
| One-named western hero | 22 |
| One-named vocalist | 18 |
| One-named Venetian master | 25 |
| One-named Vegas headliner | 25 |
| One-named UK singer | 19 |
| One-named Tevye portrayer | 25 |
| One-named Tejano singer | 23 |
| One-named teen idol of the late '50s/early '60s | 55 |
| One-named Swedish songstress | 28 |
| One-named Swedish pop singer | 28 |
| One-named supermodel married to David Bowie | 43 |
| One-named supermodel from Somalia | 33 |
| One-named supermodel | 20 |
| One-named sports star who was once the highest-paid athlete in the world | 72 |
| One-named sports star | 21 |
| One-named sports legend | 23 |
| One-named Spanish singer/actress | 32 |
| One-named Spanish singer | 24 |
| One-named Spanish entertainer | 29 |
| One-named South African pop star | 32 |
| One-named Somalian supermodel | 29 |
| One-named Somalian model | 24 |
| One-named Somali model | 22 |
| One-named soccer star | 21 |
| One-named soccer legend | 23 |
| One-named soccer immortal | 25 |
| One-named singing star with the surname Adkins | 46 |
| One-named singer/songwriter of the 1970 Woodstock-inspired hit "Lay Down" | 83 |
| One-named singer/producer with "So Sick" | 50 |
| One-named singer/model filmed by Andy Warhol | 44 |
| One-named singer/actress associated with Warhol | 47 |
| One-named singer/actress | 24 |
| One-named singer with the hit "Orinoco Flow" | 54 |
| One-named singer with the hit "Locked Up" | 51 |
| One-named singer with the debut album "Leave (Get Out)" | 65 |
| One-named singer with the albums "19" and "21" | 66 |
| One-named singer with the 2010 hit "Rolling in the Deep" | 66 |
| One-named singer with the 2008 Grammy for Best New Artist | 57 |
| One-named singer with the 2006 hit "Too Little Too Late" | 66 |
| One-named singer with the 2003 hit "Rock Wit U (Awww Baby)" | 69 |
| One-named singer with the 2002 #1 hit "Foolish" | 57 |