The XENONnT experiment is an ultra-low background liquid xenon Time Projection Chamber at the Gran Sasso National Laboratory in Italy. Beyond its primary science goal to detect WIMP dark matter, XENONnT will be highly sensitive to a variety of rare neutrino processes. The previous XENON1T measured the half-life of the two-neutrino double-electron capture process of Xenon-124. In XENONnT, with a few hundred kilograms of Xenon-136 in the fiducial volume, we will search for hints of neutrinoless double beta decay. Several detector upgrades improve XENONnT's sensitivity to low-energy interactions with neutrinos directly. Through coherent elastic neutrino-nucleus scattering, XENONnT will measure solar Boron-8 neutrinos and neutrinos from a potential galactic supernova. A significant number of solar pp and Beryllium-7 neutrinos are also expected to produce electronic recoils. In this talk, I will give an overview of the impressive capability of the XENONnT detector to observe rare neutrino phenomena.