This paper reports the densities and viscosities of a series of ethanolamines consisting of monoethanolamine, diethanolamine, triethanolamine, N,N-dimethylethanolamine, N,N-diethylethanolamine, N-methyldiethanolamine, and N-ethyldiethanolamine. The densities and viscosities of these ethanolamines were measured up to the normal boiling point of the liquids at atmospheric pressure. The data were correlated using simple expressions and using a modified rough hard sphere model for the viscosity.