Diffusion coefficients (D-12), kinematic viscosities (v), and refractive indices (n) are reported over the whole concentration range for the following binary systems : heptane + ethylbenzene and sulfolane + 1-methylnaphthalene at 313.15 and 333.15 K and water + N,N-dimethylformamide, water + methanol, water + N-formylmorpholine, and water + N-methylpyrrolidone at 283.15 and 313.15 K. The diffusion coefficients were measured by the dispersion method and compared with literature values. Each of the six system plots of the diffusion coefficients against mole fraction exhibits a minimum. For the aqueous systems, except water + N-formylmorpholine, the kinematic viscosities at a given temperature show a maximum and there is a corresponding minimum in D-12.