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Viscosities, η, of five binary mixtures of 2-methylpropane nitrile with aromatic hydrocarbons, viz. benzene, methylbenzene, 1,4-dimethylbenzene, chlorobenzene and 1,2-dichlorobenzene, have been measured at temperatures 303.15 and 308.15 K. Deviations in viscosities, Δ η, from the linear mixing rule have been determined for all of the binary mixtures studied at both experimental temperatures. The Δ η values are negative for all the five systems at both experimental temperatures. Parameters of the Redlich-Kister and Myers and Scott equations have been fitted to the Δ η values and standard deviations, σ(Δ η), have also been evaluated. The correlating performances of several viscosity models have been evaluated. The Hind-McLaughlin-Ubbelohde viscosity model gives fairly constant interaction parameters with composition. Results are discussed in terms of unlike molecular interactions between the components of the binary mixtures. [ABSTRACT FROM AUTHOR]