  Neutrino oscillations present the only robust example of experimentally
detected physics beyond the standard model. This review discusses the
established and several hypothetical beyond standard models neutrino
characteristics and their cosmological effects and constraints. Particularly,
the contemporary cosmological constraints on the number of neutrino families,
neutrino mass differences and mixing, lepton asymmetry in the neutrino sector,
neutrino masses, light sterile neutrino are briefly reviewed.
