A number is a mathematical concept used to describe and assess quantity. Number may also refer to:

Numb3rs, an American TV show

Numbers (Nanoha), a group of characters in Magical Girl Lyrical Nanoha StrikerS anime series

Grammatical number, a morphological grammatical category indicating the quantity of referents

Telephone number, often referred to as simply a number

The Book of Numbers, part of the Torah, the fourth book of the Bible

Numbers game, a gambling scheme common in poor US urban neighborhoods

"Numbers" (Lost), an episode of the Lost TV series

Numbers (Cat Stevens album), an album by Cat Stevens

Number (game), a number-guessing computer game

Numbers (software), a spreadsheet application developed by Apple as part of its iWork '08 suite

Number (music), a self-contained piece of music

Number (magazine), a Japanese sports magazine