  Greg McShane introduced a remarkable identity for the lengths of simple
closed geodesics on cusped hyperbolic surfaces. This was subsequently
generalized by the authors to hyperbolic cone-surfaces, possibly with cusps
and/or geodesic boundary. In this paper, we generalize the identity further to
the case of classical Schottky groups. As a consequence, we obtain some
surprising new identities in the case of fuchsian Schottky groups. For
classical Schottky groups of rank 2, we also give generalizations of the
Weierstrass identities, first given by McShane.
