  The nonlocal Darboux transformation for the stationary axially symmetric
Schr\"odinger and Helmholtz equations is considered. Formulae for the nonlocal
Darboux transformation are obtained and its relation to the generalized Moutard
transformation is established. New examples of two - dimensional potencials and
exact solutions for the stationary axially symmetric Schr\"odinger and
Helmholtz equations are obtained as an application of the nonlocal Darboux
transformation.
