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The T2K experiment presents new measurements of neutrino oscillationparameters using $19.7(16.3)\times10^{20}$ protons on target (POT) in(anti-)neutrino mode at the far detector (FD). Compared to the previousanalysis, an additional $4.7\times10^{20}$ POT neutrino data was collected atthe FD. Significant improvements were made to the analysis methodology, withthe near-detector analysis introducing new selections and using more thandouble the data. Additionally, this is the first T2K oscillation analysis touse NA61/SHINE data on a replica of the T2K target to tune the neutrino fluxmodel, and the neutrino interaction model was improved to include new nucleareffects and calculations. Frequentist and Bayesian analyses are presented,including results on $\sin^2\theta_{13}$ and the impact of priors on the$\delta_\mathrm{CP}$ measurement. Both analyses prefer the normal mass orderingand upper octant of $\sin^2\theta_{23}$ with a nearly maximally CP-violatingphase. Assuming the normal ordering and using the constraint on$\sin^2\theta_{13}$ from reactors, $\sin^2\theta_{23}=0.561^{+0.021}_{-0.032}$using Feldman--Cousins corrected intervals, and$\Delta{}m^2_{32}=2.494_{-0.058}^{+0.041}\times10^{-3}~\mathrm{eV^2}$ usingconstant $\Delta\chi^{2}$ intervals. The CP-violating phase is constrained to$\delta_\mathrm{CP}=-1.97_{-0.70}^{+0.97}$ using Feldman--Cousins correctedintervals, and $\delta_\mathrm{CP}=0,\pi$ is excluded at more than 90%confidence level. A Jarlskog invariant of zero is excluded at more than$2\sigma$ credible level using a flat prior in $\delta_\mathrm{CP}$, and justbelow $2\sigma$ using a flat prior in $\sin\delta_\mathrm{CP}$. When theexternal constraint on $\sin^2\theta_{13}$ is removed,$\sin^2\theta_{13}=28.0^{+2.8}_{-6.5}\times10^{-3}$, in agreement withmeasurements from reactor experiments. These results are consistent withprevious T2K analyses.

Measurements of neutrino oscillation parameters from the T2K experiment using $3.6\times10^{21}$ protons on target