There is a total of 85689 clues beginning with o
- One of Johns Hopkins' most famous professors
- One of Jolie's daughters
- One of Jolie's girls
- One of Jon Arbuckle's pets
- One of Joseph Mankiewicz's talents
- One of journalism's "five Ws"
- One of journalism's five W's
- One of Jubal's inventions
- One of Judaism's four matriarchs
- One of Judy Garland's daughters
- One of Judy Garland's girls
- One of Judy's children
- One of Judy's daughters
- One of Judy's girls
- One of Julia's exes
- One of Juliana's daughters
- One of Juliette Low's groups
- One of Julius Caesar's names
- One of Jupiter's Galilean moons
- One of Jupiter's Galilean satellites
- One of Jupiter's moon
- One of Jupiter's moons
- One of Jupiter's satellites
- One of just 12 in Alaska: Abbr
- One of just three governors
- One of Karel Capek's R U R
- One of Karim's titles
- One of Katherine Cornell's roles
- One of Keats' feats
- One of Keebler's elves
- One of Kefauver's witnesses
- One of Kelsey's co-stars
- One of Kelsey's costars
- One of Kentucky's 43 Across
- One of Kenya's official languages
- One of Kimble's many, on "The Fugitive"
- One of King David's aides
- One of King David's choir
- One of King David's guard
- One of King David's guards
- One of King David's men
- One of King Lear's daughters
- One of King Lear's daughters
- One of King Lear's heirs
- One of King Solomon's interests
- One of Kipling's "Barrack-Room Ballads”
- One of Kipling's "twain"
- One of Kipling's "twain"
- One of Kipling's famous trio
- One of Kipling's three
- One of Kipling's trio, elliptically
- One of Kirk's crewmen
- One of Kirk's lieutenants
- One of Klink's POWs
- One of Knight's group
- One of Knute's followers
- One of Knute's successors
- One of Kotter's Sweathogs
- One of Kraftwerk
- One of Kraftwerk?
- One of Kramden's hardy followers?
- One of Kreskin's claims
- One of Kukla's pals
- One of Kurt's lyricists
- One of L Gehrig's 1,995
- One of LBJ's beagles
- One of LBJ's dogs
- One of LBJ's pets
- One of LBJ's presidential dogs
- One of La Guardia's nicknames
- One of Laban's daughters
- One of Lady Bird's names
- One of Lamech's wives
- One of Larry Summers' guys
- One of las Canarias
- One of Las Islas Baleares
- One of last year's frosh
- One of Lawrence's men
- One of LBJ's beagles
- One of LBJ's daughters
- One of LBJ's dogs
- One of LBJ's pups
- One of LBJ's titles
- One of Leakey's "Trimates"
- One of Lear's daughters
- One of Lear's daughters
- One of Lee's boys
- One of Lee's men
- One of Lee's men, for short
- One of Lee's soldiers
- One of Lemay's men
- One of Lemony's characters
- One of Lemuel Shepherd's men
- One of Lendl's rivals
- One of Leno's forerunners
- One of Leo Durocher's boys
- One of Leonardo's interests: Abbr
- One of les États-Unis
- One of les planetes
- One of les points cardinaux