There is a total of 85689 clues beginning with o
- Only film of its series directed by William Shatner
- Only film to sweep the major categories at the Golden Raspberries
- Only Finland paid them, after World War I
- Only fish in the sea?
- Only fish?
- Only five-time Horse of the Year
- Only five-time US Horse of the Year
- Only for certain tastes
- Only form that carbohydrates take?
- Only founding member of OPEC not located in the Mideast
- Only four-letter Great Lake
- Only four-letter room in Clue
- Only four-term POTUS
- Only four-term prez
- Only freely flying mammals
- Only French-produced film to win an Oscar for Best Picture (2011)
- Only gem made by an animal
- Only gestured and moved
- Only GnR original member
- Only God can make one, according to Kilmer
- Only God can make one, according to Kilmer
- Only good part of a bad movie?
- Only graphic novel to win a Pulitzer Prize (awarded 1992)
- Only Great Lake bordering Pennsylvania
- Only Great Lake that borders Pennsylvania
- Only group with elements in all three states of matter at room temperature
- Only guest host in the 21 years of Leno's "The Tonight Show"
- Only half
- Only half-pretentious?
- Only have eyes for
- Only head coach in six Super Bowls
- Only highest grossing film of the year to run at a loss
- Only highest-grossing film of the year that lost money
- Only hip-hop group that performed at Live Aid
- Only his tail was left after a brawl
- Only Hispanic performer with an Emmy, Grammy, Oscar and Tony
- Only hit song for which title and artist are both palindromes
- Only Hitchcock film to get a Best Picture Oscar
- Only Hitchcock film to win Best Picture
- Only horse to beat Man o' War
- Only host country to win the Women's World Cup
- Only human, briefly
- Only humans shed these
- Only Huxtable boy
- Only hypothetical
- Only if
- Only if it's worth the trade-off
- Only Illinois-born President
- Only in the past
- Only inanimate zodiac representation
- Only inanimate zodiac sign
- Only inanimate zodiac symbol
- Only Indonesian province with a Hindu majority
- Only Indonesian-speaking President
- Only inductee into both the Rock and Roll Hall of Fame and the National Inventors Hall of Fame
- Only ingredient in Accent, in brief
- Only insects that can turn their heads to look behind them
- Only its Touch model is currently sold
- Only Japanese MLB player to pitch a no-hitter (he had two)
- Only Jet who was a Super Bowl MVP
- Only just
- Only just broke the tape
- Only just get, with "out"
- Only just managed (with "out")
- Only just managed, with "out"
- Only just
- Only key Irving Berlin composed in
- Only landlocked country in Southeast Asia
- Only last name shared by two different Best Actor Oscar winners
- Only Literature Nobelist also to win an Oscar
- Only living species of its genus
- Only living thing that can be seen from outer space
- Only lizards to have voices
- Only look
- Only MLB team never to have played in a World Series
- Only MLB team that Johnny Bench played for (1967-83)
- Only main “Seinfeld” character who was not in the show’s pilot episode
- Only major "M*A*S*H" character played by the same actor in the film and TV series
- Only major league team without a no-hitter to its credit
- Only major tourney that Sam Snead failed to win
- Only major US city bisected by a mountain range
- Only major US city with a radio station whose call letters spell the city's name
- Only major-league player to enter the 3,000-hit club in the 1980s
- Only make-believe
- Only making the grade?
- Only male player with more French Open crowns than Borg
- Only male singles Career Golden Slam winner
- Only mammal capable of true flight
- Only mammal with horns made of keratin
- Only mammals capable of true flight
- Only man ever to win an LPGA Tour tournament (1962)
- Only man to be US Pres and Chief Jst
- Only man to be US President and Chief Justice
- Only man to fly in Mercury, Gemini and Apollo missions
- Only man to pitch 17 Across twice in a row (1938)
- Only man to serve as US President and Chief Justice of the Supreme Court
- Only man to twice win the US Open without losing a set in the entire tournament
- Only man to win both a Nobel Prize and an Oscar
- Only man to win two tennis Grand Slams
- Only marsupial native to the Americas