In order to measure neutrino oscillation parameters, long-baseline accelerator neutrino experiments are using MC simulations to determine initial neutrino flux. Uncertainties of the hadron production models limit the knowledge of the neutrino flux. Additional hadron production measurements are needed to reduce this uncertainty. The only experiment currently capable of providing such measurements is the NA61/SHINE experiment. I present recently published NA61/SHINE hadron production measurements for the T2K experiment which include spectra of hadrons $(π^{±}, K^{±}, p, K^0_s and Λ)$ in the proton-carbon interaction at 31 GeV/c and $π^{±}$ spectra exiting the surface of the T2K replica target.