The preferential solvation of neutral and ionic organic species (phenol, nitroanilines, N-methylbutyramide, 1,4-dioxane, acetate and tetraalkylammonium ions) in binary solvent mixtures (aqueous CH 3 CN, DMSO, EtOH, 1-PrOH, CH 3 CON(CH 3 ) 2 ; CH 2 Cl 2 /Et 2 O; 1,4-dioxane/benzene; cyclohexane/THF) has been investigated through the analysis of the relative intensities of intermolecular 1 H NOESY cross-peaks according to Macura ± Ernst theory. Observed preferential solvation is discussed in terms of the strength of individual solute ± solvent interactions, hydrophobic interactions in water-rich mixtures, and microheterogeneity in the mixed medium.