  We investigate the Noether symmetries of the Klein--Gordon Lagrangian for
Bianchi I spacetime. This is accomplished using a set of new Noether symmetry
relations for the Klein--Gordon Lagrangian of Bianchi I spacetime, which
reduces to the wave equation in a special case. A detailed Noether symmetry
analysis of the Klein--Gordon and the wave equations for Bianchi I spacetime is
presented, and the corresponding conservation laws are derived.
