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Scalar may refer to:

  • Scalar (mathematics), an element of a field, which is used to define a vector space, usually the field of real numbers
  • Scalar (physics), a physical quantity that can be described by a single element of a number field such as a real number
    • Lorentz scalar, a quantity in the theory of relativity which is invariant under a Lorentz transformation
    • Pseudoscalar, a quantity representable by a mathematical scalar that reacts sensitively to transformations changing the orientation of coordinate systems, e.g. improper rotations, or an object in Clifford algebras and similar settings
  • Variable (computing), or scalar, an atomic quantity that can hold only one value at a time
  • Scalar particle in physics is a boson subatomic particle whose spin equals zero

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