  The Super-Kamiokande experiment has collected more than 11 live-years of
atmospheric neutrino data. Atmospheric neutrinos cover a wide phase space in
both energy and distance travelled, the parameters relevant for studying
neutrino oscillations. We present here recent measurements of the three-flavor
neutrino oscillation parameters using this atmospheric neutrino data, as well
as new limits on mixing with a fourth sterile neutrino state.
