  The solar neutrino problem has persisted for almost three decades. Recent
results from Kamiokande, SAGE, and GALLEX indicate a pattern of neutrino fluxes
that is very difficult to reconcile with plausible variations in standard solar
models. This situation is reviewed and suggested particle physics solutions are
discussed. A summary is given of the important physics expected from SNO,
SuperKamiokande, and other future experiments.
