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A neutrino hotspot is a location on the celestial sphere from which a significant number of neutrinos have been observed. The term may be used after a particular astronomical object is established to be the neutrino source, but has the benefit of indicating such a location even if no source-object has been established. Discovery of such hotspots is a first step toward identifying such objects, of interest in investigating the objects and their processes, which falls under the heading of multi-messenger astronomy. Some current and planned neutrino observatories, such as IceCube, are designed to determine the trajectory of their detected neutrinos, and thus identify such hot spots. Any such identification implies use of some threshold. Example declared hotspots include galaxy NGC 1068 and blazar TXS 0506+056.