- Only commonly ingested rock
- Only companion
- Only composer Nobelist
- Only continent larger than Africa
- Only country in which Catalan is the official language
- Only country that starts with O
- Only country whose capital starts with "Q": Abbr.
- Only country with a non-rectangular flag
- Only country with a nonrectangular flag
- Only country without a rectangular flag
- Only creature besides humans to farm other creatures
- Only creature that blushes
- Only crime defined in the Constitution
- Only daughter of Elizabeth II
- Only daughter of Queen Elizabeth II and Prince Philip
- Only DC-born VP
- Only deaf performer to win an Oscar
- Only defenseman to have won the N.H.L. scoring title (1970, 1975)
- Only defenseman to lead the NHL in scoring
- Only digit in the ZIP code for Newton Falls, Ohio
- Only direction not in a state name
- Only domestic species in the family Felidae
- Only Dwarf without a beard
- only eats meat
- Only English pope
- Only Englishman named a Dr. of the Church
- Only essential components
- Only European capital on both a river and an ocean
- Only even prime
- Only even prime number
- Only event in which Venezuela medaled at the 2012 Olympics
- Only externally visible part of the central nervous system
- Only fair
- Only fair, or an alternative title for this puzzle?
- Only female attorney general
- Only female Israeli prime minister
- Only female role in a certain Bard romance
- Only Fibonacci number that appears twice in the sequence
- Only for certain tastes
- Only founding member of OPEC not located in the Mideast
- Only four-letter Great Lake
- Only four-letter room in Clue
- Only four-term prez
- Only freely flying mammals
- Only gem made by an animal
- Only gestured and moved
- Only God can make one, according to Kilmer
- Only God can make one: 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 Greek state motto
- Only half-pretentious?
- Only have eyes for
- Only highest-grossing film of the year that lost money
- 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 horse to defeat Man o' War
- Only host country to win the Women's World Cup
- Only hypothetical
- Only if
- only in a chosen few
- Only in name
- Only in the past
- Only inanimate sign
- Only inanimate zodiac representation
- Only inanimate zodiac sign
- Only inanimate zodiac symbol
- Only Indonesian-speaking President
- Only ingredient in Accent, in brief
- Only Iowa-born president
- Only its Touch model is currently sold
- Only Jet who was a Super Bowl MVP
- only just
- Only just achieved, with "out"
- Only just broke the tape
- Only just get, with "out"
- Only just managed, with "out"
- Only known animal to prey on great white sharks
- 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 thing that can be seen from outer space
- Only look
- Only M.L.B. team that Johnny Bench played for (1967-83)
- 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 Texas city on Mountain Time
- Only major U.S. city bisected by a mountain range
- Only major U.S. city with a radio station whose call letters spell the city's name
- Only make-believe
- Only male singles Career Golden Slam winner
- Only male-lead Emmy actor for comedy and drama
- Only mammal with horns made of keratin
- Only man ever to win an L.P.G.A. Tour tournament (1962)
- Only man to be U.S. President and Chief Justice
- Only man to serve as U.S. President and Chief Justice of the Supreme Court
- Only man to win both a Nobel Prize and an Oscar
- Only man to win two tennis Grand Slams
- Only matchmaker in town?
- Only member of both OPEC and the British Commonwealth
- Only Met ever to have a 30-game hitting streak
- Only metal that's liquid at room temperature
- Only Mexican state that borders Baja
- Only mildly sweet
- Only minimally
- Only Mississippi-born Literature Nobelist
- Only MLB'er to hit 60 homers thrice
- Only mo. that can begin and end on the same day
- Only mo. that can begin and end on the same day of the week
- Only mo. that can pass without a single full moon
- Only mo. that can start and end on the same day
- Only monosyllabic state
- Only monosyllabic U.S. state
- only mosquitoes bite you
- only murders in the building steamer
- Only musician to hit #1 on the Billboard Hot 100 as both a vocalist and an instrumentalist
- Only N.F.L. franchise to win championships representing three different cities
- Only N.F.L. team with a perfect season (1972)
- Only nation with a Caspian and Indian Ocean coastline
- Only native Englishman ever named Doctor of the Church by a pope
- Only NATO member with no standing army
- Only NFC team that hasn't played in a Super Bowl
- Only NFL coach with a perfect season
- Only NFL quarterback with more than 10,000 pass attempts
- Only NFL team to lose all 16 games in a season
- Only NFL team with a perfect season
- Only NFL team without a helmet logo, on scoreboards
- Only Nobelist besides Marie to win the prize in two fields
- Only non-rhyming Pac-Man ghost
- Only non-Southern state won by the G.O.P. in '64
- Only non-U.S. M.L.B. team, on scoreboards
- Only non-U.S. M.L.B. team: Abbr.
- Only nonrhyming ghost in Ms. Pac-Man
- Only nonsentient zodiac symbol
- Only nonvocal instrument in Britten's "A Ceremony of Carols"
- Only nonvocal instrument in Britten's "Ceremony of Carols"
- Only now and then
- Only number that can be typed with a keyboard's top row
- Only O.K.
- Only O.T. book that never mentions God: Abbr.
- Only occupant of Vostok I
- Only off when mad dogs go out?
- Only okay
- Only one
- Only one assigned to a bomb?
- Only one bears the name of a U.S. president
- Only one fed. holiday falls on it annually
- Only one of Rolling Stone's "500 Greatest Songs" not written in English
- Only one of the 13 Colonies not touching the Atl. Ocean
- Only one of the Seven Dwarfs to wear glasses
- Only one person can do it
- ONLY one time
- Only one U.S. prez has had one
- only one way to get to the top
- Only one-syllable state
- Only one-syllable state capital
- Only Oscar winner/Nobelist before Dylan
- Only other state in Alaska's time zone
- Only outfielder besides Winfield to win Gold Gloves in both leagues in the 1900s
- Only Pacific island monarchy
- Only palindromic French Open champ
- Only palindromic top-40 song title from a palindromic-name group
- Only part of Egypt in Asia
- Only part of Egypt located in Asia
- Only partly
- only partly in existence
- Only partner
- Only patron on "Cheers" to appear in all 275 episodes
- Only Pennsylvania county that borders New York and Ohio
- Only performer with a speaking part in 1976's "Silent Movie"
- Only person to win both an Academy Award and a Nobel Prize
- Only person to win both an Oscar and a Nobel
- Only person to win Emmys for acting, writing and directing
- Only person to win the Nobel Prize in two different scientific fields
- Only pitcher whose jersey number was retired by the Mets
- Only place in the U.S. to host both the Summer and Winter Olympics, informally
- Only place where some ideas look good
- Only places to find anteaters in the U.S.
- Only planet not named for a god
- Only planet with exactly one moon
- Only player on more than two winning World Cup teams
- Only player other than Sheffield to make the All-Star team with five different clubs
- Only player to appear in both the Super Bowl and World Series
- Only player to ever sink an ace in a Skins Game
- Only player to hit 60 home runs in a season three times
- Only player with three 60+ home run seasons
- Only poisonous snake in Britain
- Only positive integer that's neither prime nor composite
- Only pres. born in Missouri
- Only president besides Washington to run unopposed
- Only president born in Hawaii
- Only president born in New Hampshire
- Only president born outside the continental United States
- Only president from Mo.
- Only president other than LBJ born in Texas
- Only president to administer the oath of office to two other presidents
- Only president to be married in the White House
- Only President to become Chief Justice
- Only president to graduate from Columbia University
- Only president to have 15 children
- Only president to scale the Matterhorn
- Only president to serve as both vice president and president without being elected to either office
- Only president to win a Pulitzer
- Only president to win a Pulitzer Prize
- Only president who was also a chief justice
- Only president who was also chief justice
- Only president whose grandfather was also president
- Only president with three VPs
- Only private non-American to address a joint session of Congress (1989)
- Only proper noun in the Beatles' "Revolution"
- Only QB to start five Super Bowls
- Only reason to watch the Super Bowl, some say
- Only reigning pope to write an autobiography
- Only remaining
- Only remaining home of the Asiatic cheetah
- Only republic on the Arabian Peninsula
- Only Rose, Aaron, Musial, Mays, Bonds, and Yount have played more National League games than him
- Only sch. to win both the men's and women's N.C.A.A. basketball titles in the same year
- Only Semitic language that's an official language of the European Union
- Only single-syllable state capital
- Only single-syllable state name
- Only single-syllable surname in an immortal '60s quartet
- Only slightly
- Only so far
- Only so-called "Decade Volcano" in the continental U.S.
- Only so-so
- Only soccer player who can throw the ball
- Only song on Rolling Stone's "500 Greatest Songs of All Time" list that is not sung in English
- Only South Dakota-born VP
- Only Spanish city to host the Olympics
- Only speaker in "Silent Movie"
- Only speaking female in Pooh books
- only species in the family Ornithorhynchidae
- Only spoken word (by Marcel Marceau) in Mel Brooks's "Silent Movie"
- Only state bordered by just one other
- Only state capital that shares no letters with the name of its state
- Only state capital that's not a county seat
- Only state name beginning with two vowels
- Only state that borders six states and Canada
- Only state which shares a time zone with Alaska
- Only state whose entire east and west borders are rivers
- Only state whose name starts with two vowels
- Only state with a non-rectangular flag
- Only state with a nonrectangular flag
- Only state with a swallowtail flag