The present volume comprises data on viscosities of non-electrolyte systems, containing pure organic liquids and binary liquid mixtures at normal pressure. Production, transportation and use of liquid materials directly depend on their physical features, among which their viscosities play a key role.Travelling through a pipe, drying out of a building material, dispensing a fluid into packaging are just few examples of how important reliable data on liquid viscosities are.The data present viscosities as a function of temperature and - for binary mixtures - of composition at normal pressure.