  We perform a classification of the Lie and Noether point symmetries for the
Klein-Gordon and for the wave equation in pp-wave spacetimes. To perform this
analysis we reduce the problem of the determination of the point symmetries to
the problem of existence of conformal killing vectors on the pp-wave
spacetimes. We use the existing results of the literature for the isometry
classes of the pp-wave spacetimes and we determine in each class the functional
form of the potential in which the Klein-Gordon equation admits point
symmetries and Noetherian conservation law. Finally we derive the point
symmetries of the wave equation and we find that the maximum Noether algebra
has dimension seven, that is the case of plane wave spacetimes.
