The SPS Heavy Ion and Neutrino Experiment (NA61/SHINE) is a fixed-target hadron spectrometer at CERN’s Super Proton Synchrotron. It has a dedicated program to measure hadron-nucleus interactions with the goal of constraining accelerator-based neutrino flux, which mainly originates from the inadequate understanding of primary and secondary hadron production. NA61/SHINE’s previous measurements of protons colliding on thin carbon targets and a replica T2K target have significantly reduced the flux uncertainty in the T2K experiment. In this talk, I will present NA61/SHINE’s recent results and ongoing hadron production measurements, current data-taking, and future plans for the neutrino physics program.