There is a total of 85689 clues beginning with o
- One of the subtractive primaries
- One of the Sudanese
- One of the Sunda Islands
- One of the Sunda Isles, Jap-held
- One of the Sunda Isles
- One of the Sundays
- One of the Suomi
- One of the Super Bowl-winning Mannings
- One of the superheroes in 2012's "The Avengers"
- One of the superstates in "1984"
- One of the Supremes
- One of the surveyors of a well-known line
- One of the Sweathogs
- One of the T-men's chief concerns
- One of the tallest birds
- One of the Talmadge girls
- One of the Talmadges
- One of the tapirs
- One of the Taylors
- One of the Taylors
- One of the teams that made the Pac-10 the Pac-12
- One of the Teenage Mutant Ninja Turtles
- One of the Teletubbies
- One of the Temptations
- One of the Ten Attic Orators of ancient Greece
- One of the ten best-dressed women
- One of the Ten Commandments, more likely than not
- One of the ten divisions of a bowling game
- One of the Ten Plagues
- One of the ten Roman magistrates
- One of the tennis-playing Williamses
- One of the tenses
- One of the Testaments
- One of the Teutonic Fates
- One of the thanes in "Macbeth"
- One of the theatres of war
- One of the themes
- One of the things little boys are made of, and a hint to 20-, 31- and 41-Across
- One of the things the slithy toves did in the wabe
- One of the Thomases
- One of the Thomases
- One of the Thompsons
- One of the three "green" R's
- One of the Three B's
- One of the Three B's of classical music
- One of the Three B's of music
- One of the Three Bears
- One of the three D's
- One of the three dimensions
- One of the three estates
- One of the three Fates
- One of the three Fates
- One of the Three Fires of Buddhism
- One of the three flavors of Neapolitan ice cream, for short
- One of the three Furies
- One of the three Furies
- One of the three Furies: Myth
- One of the three Gorgons
- One of the three Graces
- One of the three Graces
- One of the three Greek Furies
- One of the three green R's
- One of the three H's
- One of the three H's in a summer weather forecast
- One of the three kingdoms
- One of the Three Kings
- One of the Three Magi
- One of the three musical B's
- One of The Three Musketeers
- One of the Three Musketeers
- One of the three NAFTA signatories
- One of the three on "Three's Company"
- One of the three original Muses
- One of the three R's
- One of the three R's of eco-friendliness
- One of the three R's of environmentalism
- One of the three R's
- One of the three R's: Abbr
- One of the Three Rivers
- One of the three rivers of Three Rivers Stadium
- One of the three Rs (abbr)
- One of the three states of matter
- One of the Three Stooges
- One of the three subjects of the sports book "American Triumvirate"
- One of The Three Tenors
- One of the three unities, in drama
- One of the three virtues
- One of the three water signs, in astrology
- One of the Three Wise Men
- One of the tides
- One of the tides?
- One of the Titanesses
- One of the Titans
- One of the Titans, son of Ursanus
- One of the Titans
- One of the Titans: Var
- One of the title kids in an '80s film
- One of the top brass
- One of the top film stars of the '40s
- One of the top things on a to-do list