Retention data on C6 through C10 aromatic hydrocarbons were determined by the use of capillary columns. The selectivities for the aromatic compounds were investigated with six stationary liquids. In any cases there are some unseparated groups, and it is necessary to associate results obtained with any two substrates for the analysis of complex mixtures. When squalane and polypropylene glycol columns were used, C6 through C10 aromatic mixtures were analyzed easily.