Super-Kamiokande, a giant underground water Cherenkov detector in Japan, can detect neutrinos from the Sun, from cosmic ray showers in the atmosphere, and from supernovae. Super-K's measurements of solar and atmospheric neutrinos have had a profound effect on our understanding: atmospheric neutrinos show very strong evidence of oscillation, and the measured properties of solar neutrinos constrain the allowed solar neutrino oscillation parameter space.

The K2K (KEK to Kamioka) experiment is the first "long baseline" neutrino oscillation experiment. It aims to test the atmospheric neutrino oscillation hypothesis with a beam of GeV muon neutrinos sent across Japan to the Super-K experiment.

This talk will report on the latest Super-K and K2K results, and will give an overview of the current picture of neutrino oscillations.