None

None may refer to:
 * Zero, the mathematical concept of the quantity "none"
 * Empty set, the mathematical concept of the collection of things represented by "none"
 * none, an indefinite pronoun in the English language

Music

 * None (Meshuggah EP), 1994
 * None (Cloak of Altering EP), 2013

Other uses

 * None (liturgy), the ninth hour of the traditional Christian liturgy
 * None, Piedmont, a commune in the province of Turin in the Italian region of Piedmont
 * Irreligion, a lack of religious affiliation
 * None of the above, a political expression for rejecting all available candidates
 * None, the keyword for the null pointer in Python