A number is a mathematical concept used to describe and assess quantity.

The word number can also refer to

• Telephone numbers.
• Grammatical number, a morphological grammatical category indicating the quantity of referents
• Number (music), a self-contained piece of music that is combined with other such pieces in a performance
• The "Book of Numbers", part of the Torah, the fourth book of the Bible.

• A Numbers game, a gambling scheme common in poor urban neighborhoods.
• NUMB3RS, an American TV show on CBS
• The Numbers in Lost (TV series): 4, 8, 15, 16, 23 and 42
  • "Numbers (Lost)," a focal episode of Season 1 in the series
• Numbers (Cat Stevens album) (subtitled "A Pythagorean Theory Tale"), an album by Cat Stevens
• Number (game), a number-guessing computer game.
• See also Category:Numbers

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