Excess enthalpies for (aniline + pentane or 2-methylpentane or cyclohexane or hexane or octane or decane) as well as of(aniline + cyclohexene or hex-1-ene or oct-1-ene) were measured at the temperature 363.15 K and pressure 1.89 MPa with the help of an isothermal flow calorimeter from Hart Scientific (model 7501). For all the mixtures endothermic mixing was observed.