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.