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The strange quark contribution to proton's spin ($\Delta s$) is a fundamentalquantity that is poorly determined from current experiments. Neutrino-protonelastic scattering (pES) is a promising channel to measure this quantity, andrequires an intense source of low-energy neutrinos and a low-threshold detectorwith excellent resolution. In this paper, we propose that neutrinos from agalactic supernova and their interactions with protons in large-volumescintillation detectors can be utilized to determine $\Delta s$. The spectra ofall flavors of supernova neutrinos can be independently determined using acombination of DUNE and Super-(Hyper-)Kamiokande. This allows us to predict pESevent rates in JUNO and THEIA, and estimate $\Delta s$ by comparing withdetected events. We find that the projected sensitivity for a supernova at 1kpc (10 kpc), is approximately $\pm 0.01$ ($\pm 0.15$). Interestingly, thelimits from a nearby supernova would be comparable to the results from latticeQCD, and better than polarized deep-inelastic scattering experiments. Usingsupernova neutrinos provides a true $Q^2\rightarrow 0$ measurement, and thus anaxial-mass independent determination of $\Delta s$.

Using supernova neutrinos to probe strange spin of proton with JUNO and THEIA