This chapter contains sections titled: The Proton Polarizability of Homoconjugated Hydrogen Bonds Heteroconjugated Hydrogen Bonds With Large Proton Polarizability Interaction Effects of Easily polarizable Hydrogen Bonds With Their Environments Their Behaviour in Crystals Hydrogen-Bonded Chains with a large Proton Polarizability due to Collective Proton motion-Pathway for Protons in Bigogical Memberanes Li+, Na+, K+ and Be2+ Bonds-IR Continua and Cation Polarizabilities of These Bonds Electrochemistry: Hydrogen Bonds with a Large Proton Polarziability and the Molecular Understanding of Processes in Acid and Base Solutions Large Proton Polorazability With families of Systems in Various pKa Regions-MIR, FIR, and NMR Results Easily Polorizable Hydrogen Bonds in Proteins-Studies of Model Systems Significance of Hydrogen Bonds With a large Proton Polarizablility in the Catalytic Mechanisms of Enzymes