Densities (ρ) for binary mixtures of ethanol (1) + diisopropyl ether (DIPE) or cyclohexane or alkane (C6-C9) (2) were measured at 298.15 K, 308.15 K and 318.15 K. The excess molar volume ( ) of binary mixtures was calculated using ρ data and correlated with Redlich-Kister polynomial equation. The V EM values for binary mixtures of ethanol (1) + cyclohexane or n-alkane (C6-C9) (2) were positive, whereas for ethanol (1) + DIPE (2) these were negative. The magnitude of V EM values follows the order: cyclohexane > n-nonane > n-octane > n-heptane > n-hexane > DIPE. The V EM values have been interpreted qualitatively and also quantitatively in terms of Flory-Treszczanowicz-Benson (FTB) model and Prigogine-Flory-Patterson (PFP) theory. The V EM values predicted using FTB model agree well with experimental V EM values at all mole fractions. But the PFP theory describes well data in ethanol-rich region (x1 > 0.5) for all binary mixtures and is able to predict the sign of V EM curve for ethanol-lean region (x1 < 0.5) except for ethanol (1) + nonane (2) mixtures.