  In this paper the Diffusion Monte Carlo (DMC) method is applied to the
confined hydrogen atom with different confinement geometries. This approach is
validated using the much studied spherical and cylindrical confinements and
then applied to cubical and squared ones, for which data are not available, as
new applications of the method relevant to solid state physics. The energy
eigenvalues of the ground state and one low-lying excited state are reported as
a function of the characteristic confinement length.
