| 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 |
| One-named singer with the 2001 hit "Thank You" | 56 |
| One-named singer with the 1960s Velvet Underground | 50 |
| One-named singer with the #1 hit 'Goodies' | 50 |
| One-named singer with "Tik Tok" | 41 |
| One-named singer with "Die Young" | 43 |
| One-named singer with "19" and "21" | 55 |
| One-named singer who recorded 'Thank You' | 49 |
| One-named singer who married Heidi Klum | 39 |
| One-named singer who guest starred on "The Love Boat" | 63 |
| One-named singer seen in "Dirty Dancing: Havana Nights" | 65 |
| One-named singer sampled on Eminem's "Stan" | 57 |
| One-named singer sampled in Eminem's "Stan" | 57 |
| One-named singer of the 1998 hit "It's All About Me" | 66 |
| One-named singer of the 1960s | 29 |
| One-named singer of New Age music | 33 |
| One-named singer of folk and blues | 34 |
| One-named singer of children's songs | 40 |
| One-named singer of "The Wanderer" | 44 |
| One-named singer of "Smooth Operator" | 47 |
| One-named singer of "Skyfall" | 39 |
| One-named singer of "Rolling in the Deep" | 51 |
| One-named singer of 'Someone Like You' | 46 |
| One-named singer in the Rock & Roll Hall of Fame | 52 |
| One-named singer from Nigeria | 29 |
| One-named singer from Greece | 28 |
| One-named singer for the Velvet Underground | 43 |
| One-named singer for the 1960s Velvet Underground | 49 |
| One-named singer born with seven names | 38 |
| One-named singer and Oscar winner | 33 |
| One-named singer | 16 |
| One-named silkscreen designer | 29 |
| One-named rocker/actor | 22 |
| One-named rocker, venture capitalist, and humanitarian | 54 |