Reviews the current state of knowledge of neutrino masses and the related question of neutrino oscillations. After an overview of the theory of neutrino masses and mixings, detailed accounts are given of the laboratory limits on neutrino masses, astrophysical and cosmological constraints on those masses, experimental results on neutrino oscillations, the theoretical interpretation of those results, and theoretical models of neutrino masses and mixings. The book concludes with an examination of the potential of long-baseline experiments. This is an essential reference text for workers in elementary-particle physics, nuclear physics, and astrophysics.

Introduction - Winter.- Neutrino Mass, Mixing and Flavour Change- Kayser.- Laboratory Limits on Neutrino Masses- Weinheimer.- Astrophysical and Cosmological Constraints onNeutrino Masses - Kainulainen, Olive.- Experimental Results on Neutrino Oscillations - Geiser.- Theoretical Interpretation of theCurrent Neutrino Oscillation Data- Fogli,Lisi.- Theoretical Models of Neutrino Masses and Mixings - Altarelli, Feruglio.- The Physics Potential of Future Long Baseline Neutrino OscillationExperiments - Lindner.