Neutrino oscillation physics is entering the precision measurement
era. The focus of next generation neutrino experiments will be to determine the parameters governing neutrino oscillations precisely. The Hyper-Kamiokande experiment, currently under construction in Japan, includes a long-baseline neutrino oscillations program. Its main goals will be to determine whether CP violation occurs in neutrino oscillations and to provide precise measurements of neutrino oscillation parameters. To achieve this, Hyper-Kamiokande will have a large fiducial volume (8 times that of Super-Kamiokande) and will benefit from the upgrade of the J-PARC neutrino beam, enabling it to collect an unprecedented amount of data. A thorough knowledge of systematic effects and powerful near detectors are needed to match this level of precision. This talk presents the expected sensitivity of Hyper-K to oscillation parameters, notably CP violation, using a combination of accelerator and atmospheric neutrino information.