There is a total of 85689 clues beginning with o
- One of Queen Elizabeth's names
- One of Queen Juliana's capitals
- One of Queen Juliana's names
- One of Queen Victoria's prime ministers
- One of Queen Victoria's titles
- One of RR's predecessors
- One of RWR's titles
- One of racer John Andretti's sponsors
- One of Rachel Field's books
- One of racially mixed ancestry
- One of racing's "Big Three"
- One of radio's Goldbergs
- One of Randall and Beth’s daughters on “This Is Us”
- One of Randall's daughters on "This Is Us"
- One of Ray Floyd's concerns
- One of reality TV's "Guidettes"
- One of Rebekah's boys
- One of Rebekah's sons
- One of Rebekah's twins
- One of Reese's teammates
- One of Rhee's soldiers
- One of Rhode Island's founders
- One of Richard's veeps
- One of Rickey Henderson's record 1,406
- One of Ringo's set
- One of Rita's exes
- One of Rita's husbands
- One of Robin Hood's companions
- One of Robin Hood's friends
- One of Robin Hood's men
- One of Robin Hood's Merry Men
- One of Robin Hood's Merry Men [6th of 7]
- One of Robin's hoods?
- One of rock's Dees
- One of rock's Ramones
- One of Rockefeller Center's original tenants
- One of Rockefeller's many
- One of rocker Bill's bandmates?
- One of Rockne's Four Horsemen
- One of Rocky's rivals
- One of Rod Stewart's exes
- One of Rodgers's partners
- One of Rodin's masterpieces
- One of Rome's founders
- One of Rome's hills
- One of Rome's seven
- One of Rome's seven hills
- One of Rome's seven hills
- One of Ron Weasley's brothers, in the Harry Potter novels
- One of Rose's 4,256
- One of Roseanne's last names
- One of Roxy Music's Brians
- One of RSA's 11 official languages
- One of Russia's earliest saints
- One of Ryan Howard's 864
- One of Sadat's people
- One of saintdom's Fourteen Holy Helpers
- One of Salinger's Glass family
- One of Salome's seven
- One of Salt's singing partners
- One of Sam's tunes in "Casablanca"
- One of same kind
- One of Samuel Morse's middle names
- One of San Francisco's hills
- One of San Francisco's many hills
- One of Sandy's kin
- One of Santa s eight
- One of Santa's eight
- One of Santa's flying eight
- One of Santa's followers?
- One of Santa's helpers
- One of Santa's herd
- One of Santa's hitch-up
- One of Santa's kids?
- One of Santa's little helpers
- One of Santa's reindeer
- One of Santa's reindeer, in "An American Anthology"
- One of Santa's reindeer
- One of Santa's sleigh team
- One of Santa's team
- One of Santa's team
- One of Santa’s reindeer
- One of Sarah Palin's kids, after a slapstick prank is pulled on her?
- One of Sarah Palin's kids, when she's upset?
- One of Saskatchewan's US neighbors
- One of Satan's minions
- One of Saturn's astral spirits
- One of Saturn's moons
- One of Scarlett's attendants
- One of Scheherazade's heroes
- One of Schubert's most popular songs
- One of science's "strange particles"
- One of Scotland's Inner Hebrides
- One of Scrooge's four visitors
- One of seagoing trio
- One of Sean Combs' stage names
- One of Sean Combs's handles
- One of Sean Lennon's middle names
- One of Sen McCarthy's aides
- One of Sen McCarthy's targets