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 that behaves like a scalar, except that it changes sign under a parity inversion Scalar (computing), any non-composite value Scalar boson, in physics, a boson subatomic particle whose spin equals zero
See also dot product, also known as scalar product dimensionless quantity, also known as scalar quantity Inner product space Scalar field Scale (music) Scaler (disambiguation) Pterophyllum scalare (Lichtenstein, 1823), a species of freshwater angelfish Scala (disambiguation)