Binary may refer to:

Science and technology

Mathematics

* Binary number, a representation of numbers using only two digits (0 and 1) * Binary function, a function that takes two arguments * Binary operation, a mathematical operation that takes two arguments * Binary relation, a relation involving two elements * Binary-coded decimal, a method for encoding for decimal digits in binary sequences * Finger binary, a system for counting in binary numbers on the fingers of human hands

Computing

* Binary code, the digital representation of text and data * Bit, or binary digit, the basic unit of information in computers * Binary file, composed of something other than human-readable text ** Executable, a type of binary file that contains machine code for the computer to execute * Binary tree, a computer tree data structure in which each node has at most two children

Astronomy

* Binary star, a star system with two stars in it * Binary planet, two planetary bodies of comparable mass orbiting each other * Binary asteroid, two asteroids orbiting each other

Biology

* Binary fission, the splitting of a single-celled organism into two daughter cells

Chemistry

* Binary phase, a chemical compound containing two different chemical elements

Arts and entertainment

* Binary (comics), a superheroine in the Marvel Universe * Binary (Doctor Who audio), ''Binary'' (Doctor Who audio)

Music

* Binary form, a way of structuring a piece of music * Binary (Ani DiFranco album), ''Binary'' (Ani DiFranco album), 2017 * Binary (Kay Tse album), ''Binary'' (Kay Tse album), 2008 * Binary (song), "Binary" (song), a 2007 single by Assemblage 23

Novel

* Binary (novel), ''Binary'' (novel), a 1972 novel by Michael Crichton (writing as John Lange) * Binary, an evil organization in the novel ''InterWorld''

Other uses

* Binary opposition, polar opposites, often ignoring the middle ground * Gender binary, the classification of sex and gender into two distinct and disconnected forms of masculine and feminine