  A general formalism is developed that allows the construction of field theory
on quantum spaces which are deformations of ordinary spacetime. The symmetry
group of spacetime is replaced by a quantum group. This formalism is
demonstrated for the kappa-deformed Poincare algebra and its quantum space. The
algebraic setting is mapped to the algebra of functions of commuting variables
with a suitable star-product. Fields are elements of this function algebra. As
an example, the Klein-Gordon equation is defined and derived from an action.
