Null is an English word meaning 'nothing' or without value or consequence. It is derived from the Latin word nullus meaning 'none'.

Null may refer to:

• Null (computer programming), a special value in computer programming
• Null, in law, having no legal validity. See Void (law)
• Null (mathematics), a zero value in several branches of mathematics
• /dev/null, the null device in Unix-like operating systems, equivalent to the NUL device on CP/M, DOS, and Windows operating systems
• Null (physics), a concept in electromagnetism and theoretical physics
• Null (SQL), a special marker and keyword in SQL
• Null allele (genetics), also see amorph
• Null character, an ASCII value of 00 commonly used as a terminator, separator or filler
• Null cipher, a ciphertext symbol
• Null hypothesis, a hypothesis in statistics
• Null morpheme, a concept in linguistics
• Null result, the absence of the expected result in a scientific experiment
• KK Null, a Japanese musician
• The Null Corporation, is the current imprint for Nine Inch Nails.

Fiction

• Null, a character appearing in the Metal Gear Solid: Portable Ops video game
• Nulls, worm-like remains of defeated characters in the animated program ReBoot
• Null, the Living Darkness, a Marvel Comics character
• Null replaces the word "cool" in the Dystopian novel, Feed
• Null, men-eating sentinents in the Downs-Lord Triptich books by John Whitbourn
• Nul, rulers of a Galactic Empire of which earth is a province, in Brian Aldiss's Bow Down to Nul

See also

• Nil
• Nul

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