  We construct dual descriptions of (0,2) gauged linear sigma models. In some
cases, the dual is a (0,2) Landau-Ginzburg theory, while in other cases, it is
a non-linear sigma model. The duality map defines an analogue of mirror
symmetry for (0,2) theories. Using the dual description, we determine the
instanton corrected chiral ring for some illustrative examples. This ring
defines a (0,2) generalization of the quantum cohomology ring of (2,2)
theories.
